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Pfizer–BioNTech COVID-19 vaccine

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Pfizer–BioNTech COVID-19 vaccine
INN: tozinameran
Covid19 vaccine biontech pfizer 3.jpg
A vial of the Pfizer–BioNTech COVID‑19 vaccine for the U.S. market
Vaccine description
TargetSARS-CoV-2
Vaccine typemRNA
Clinical data
PronunciationTozinameran: /ˌtzɪˈnæmərən/ TOH-zih-NAM-ər-ən
Comirnaty: /kˈmɜːrnəti/ koh-MUR-nə-tee[1]
Trade namesComirnaty[2][3][4][5]
Other namesBNT162b2, COVID-19 mRNA vaccine (nucleoside-modified)
AHFS/Drugs.comMultum Consumer Information
MedlinePlusa621003
License data
Pregnancy
category
Routes of
administration
Intramuscular
ATC code
  • None
Legal status
Legal status

ZA: Section 21 [18][19]

Others: List of Pfizer-BioNTech COVID-19 vaccine authorizations
Identifiers
CAS Number
  • 2417899-77-3
PubChem SID
DrugBank
UNII
KEGG

The Pfizer–BioNTech COVID-19 vaccine (INN: tozinameran), sold under the brand name Comirnaty,[3][5] is an mRNA-based COVID-19 vaccine developed by the German biotechnology company BioNTech and for its development collaborated with American company Pfizer, for support with clinical trials, logistics, and manufacturing.[20][21] It is authorized for use in people aged twelve years and older in some jurisdictions and for people sixteen years and older in other jurisdictions,[3][22][15][23][24] to provide protection against COVID-19, caused by infection with the SARS-CoV-2 virus.[3][15] The vaccine is given by intramuscular injection. It is composed of nucleoside-modified mRNA (modRNA) encoding a mutated form of the full-length spike protein of SARS-CoV-2, which is encapsulated in lipid nanoparticles.[25] Initial advice indicated that vaccination required two doses given 21 days apart,[17][26][27][28] but the interval was later extended to up to 42 days in the US,[17][29] and up to four months in Canada.[30][31]

Clinical trials began in April 2020;[26] by November 2020, the vaccine entered Phase III clinical trials, with over 40,000 people participating.[32] An interim analysis of study data showed a potential efficacy of 91.3% in preventing symptomatic infection within seven days of a second dose and no serious safety concerns.[28][33] Most side effects are mild to moderate in severity and are gone within a few days.[34][3] The most common include mild to moderate pain at the injection site, fatigue, and headaches.[35][36] Reports of serious side effects, such as allergic reactions, are very rare[a] and no long-term complications have been reported.[3][38]

The vaccine was the first COVID‑19 vaccine to be authorized by a stringent regulatory authority for emergency use[39][40] and the first cleared for regular use.[2] In December 2020, the United Kingdom was the first country to authorize its use on an emergency basis.[38] It is authorized for use at some level in the majority of countries.[41][42][43][44] On 23 August 2021, the Pfizer–BioNTech vaccine became the first COVID-19 vaccine to be approved in the United States by the Food and Drug Administration (FDA) for those aged sixteen years and older.[5][45][46]

As of September 2021, more than 1.5 billion COVID-19 vaccine doses have been shipped by the company worldwide.[47] As of 30 March 2021, Pfizer and BioNTech aimed to manufacture about 2.5 billion doses in 2021.[48][49] Distribution and storage is a logistical challenge because the vaccine needs to be stored at extremely low temperatures.[50] BioNTech and Pfizer are testing a freeze-dried version that would not need ultracold storage.[51]

Medical uses

The Pfizer–BioNTech COVID-19 vaccine is used to provide protection against COVID-19, caused by infection with the SARS-CoV-2 virus, by eliciting an immune response to the S antigen.[3][15] The vaccine is used to reduce morbidity and mortality from COVID-19.[17]

The vaccine is supplied in a multidose vial as "a white to off-white, sterile, preservative-free, frozen suspension for intramuscular injection".[15][52] It must be thawed to room temperature and diluted with normal saline before administration.[52]

The initial course consists of two doses.[17] The World Health Organization (WHO) recommends an interval of three to four weeks between doses. Delaying the second dose by up to twelve weeks increases immunogenicity, even in older adults, against all variants of concern.[53] Authors of the Pitch study think that the optimal interval against the Delta variant is around eight weeks, with longer intervals leaving receptors vulnerable between doses.[53] To avoid deaths where supplies are limited, the WHO recommends delaying the second dose by up to twelve weeks to achieve high coverage of the first dose in high priority groups earlier.[54]

There is no evidence that a third booster dose is needed to prevent severe disease[clarification needed] in healthy adults.[55][56][54] A third dose can be added after 28 days for immunocompromised people in some countries.[57][58][59] A study in Israel with individuals aged 60 or older found that a third dose reduced the incidence of infection and of severe disease, restoring the protective effect to a level close to the initial efficacy after the second dose.[60]

Effectiveness

A case-control study published in May 2021, in The New England Journal of Medicine found that, among vaccine recipients in Qatar, the Pfizer-BioNTech vaccine has an effectiveness of 89.5% against any documented cases of the Alpha variant (lineage B.1.1.7) and 75% effectiveness against the Beta variant (lineage B.1.351). The same study reported that the effectiveness of the vaccine against severe, critical, or fatal disease against any variant of SARS-CoV-2 is 97.4%.[61]

A test-negative[note 1] case-control study published in August 2021 found that two doses of the BNT162b2 (Pfizer) vaccine had 93.7% effectiveness against symptomatic disease caused by the alpha (B.1.1.7) variant and 88.0% effectiveness against symptomatic disease caused by the delta (B.1.617.2) variant.[62] Notably, effectiveness after one dose of the Pfizer vaccine was 48.7% against alpha and 30.7% against delta, similar to effectiveness provided by one dose of the ChAdOx1 nCoV-19 vaccine.[63]

On 27 August, the Centers for Disease Control and Prevention published a study reporting that the effectiveness against infection decreased from 91% (8196%) to 66% (2684%) when the Delta variant became predominant in the US, which may be due to unmeasured and residual confounding related to a decline in vaccine effectiveness over time.[64]

The effectiveness of the vaccine starts to decline around six months.[65]

Unless indicated otherwise, the following effectiveness ratings are indicative of clinical effectiveness two weeks after the second dose. A vaccine is generally considered effective if the estimate is ≥50% with a >30% lower limit of the 95% confidence interval.[66] Effectiveness is generally expected to slowly decrease over time.[67]

Initial effectiveness by variant
Doses Severity of illness Alpha Beta Gamma Delta Others circulating previously[A]
1 Asymptomatic 38% (2945%)[69] 17% (1023%)[61] Not reported 30% (1741%)[69] 60% (5366%)
Symptomatic 27% (1339%)[69] 43% (2259%)[70] 33% (1547%)[69] 66% (5773%)
Hospitalization 83% (6293%)[B] 0% (019%)[61] 56% (−9 to 82%)[70] 94% (4699%)[B] 78% (6191%)
2 Asymptomatic 92% (9093%)[69] 75% (7179%)[61] Not reported 79% (7582%)[69] 92% (8895%)
Symptomatic 92% (8894%)[69] 88% (6196%)[70] 83% (7887%)[69] 94% (8798%)
Hospitalization 95% (7899%)[B] 100% (74100%)[61] 100%[C][70] 96% (8699%)[B] 87% (55100%)
  1. ^ Surveillance study from 20 December 2020 to 1 February 2021 in Israel.[68] During this period, according to Nextstrain, the dominant variant in Israel was lineage B.1.1.50 and the Alpha variant was becoming dominant.
  2. ^ a b c d Preliminary data of effectiveness against hospitalization referenced by Public Health England.[71][72]
  3. ^ A confidence interval was not provided, so it is not possible to know the accuracy of this measurement.


Specific populations

Based on the results of a preliminary study, the U.S. Centers for Disease Control and Prevention (CDC) recommends that pregnant women get vaccinated with the COVID‑19 vaccine.[73][74]

A statement by the British Medicines and Healthcare products Regulatory Agency (MHRA) and the Commission on Human Medicines (CHM) reported that the two agencies had reached a conclusion that the vaccine is safe and effective in children aged between 12 and 15 years.[75][76]

On 19 May 2021, experts commissioned by the Norwegian Medicines Agency concluded that the Pfizer-BioNTech vaccine is the likely cause of 10 deaths of frail elderly patients in Norwegian nursing homes. They said that people with very short life expectancies have little to gain from vaccination, having a real risk of adverse reactions in the last days of life and of dying earlier.[77]

A 2021 report by the New South Wales Government (NSW Health) in Australia found that the Pfizer-BioNTech vaccine is safe for those suffering from various forms of immunodeficiency or immunosuppression, though it does note that the data on said groups is limited, due to their exclusion from many of the vaccine earlier trials held in 2020. It notes that the World Health Organization advises that the vaccine is among the three COVID-19 vaccines (alongside that of Moderna and AstraZeneca) it deems safe to give to immunocompromised individuals, and that expert consensus generally recommends their vaccination. The report states that the vaccines were able to generate an immune response in those individuals, though it does also note that this response is weaker than in those that are not immunocompromised. It recommends that specific patient groups, such as those suffering from cancer, inflammatory bowel disease and various liver diseases be prioritised in the vaccination schedules over other patients that do not suffer from said conditions.[78]

On 20 September 2021, Pfizer announced that a clinical trial conducted in 2200 in children aged 5–11, has generated a "robust" response and is safe. They expect to submit it to the FDA and other US health agencies soon.[79]

Adverse effects

In large phase 3 trials for the vaccine there were no reported serious safety findings, and it observed low incidence of serious adverse events.[28][33]

Most side effects of the Pfizer–BioNTech COVID‑19 vaccine are mild to moderate in severity and are gone within a few days.[34][3] They are similar to other adult vaccines and are normal signs that the body is building protection to the virus.[34] During clinical trials, the common side effects affecting more than 1 in 10 people are (in order of frequency): pain and swelling at the injection site, tiredness, headache, muscle aches, chills, joint pain, and fever.[80] Fever is more common after the second dose.[80]

The European Medicines Agency (EMA) regularly reviews the data on the vaccine's safety. The safety report published on 8 September 2021 by the EMA was based on over 392 million doses administered in the European Union.[3] According to the EMA "the benefits of Comirnaty in preventing COVID‑19 continue to outweigh any risks, and there are no recommended changes regarding the use of this vaccine."[3] Rare side effects (that may affect up to 1 in 1,000 people) include temporary one sided facial drooping and allergic reactions such as hives or swelling of the face.[3]

Documented hypersensitivity to polyethylene glycol (PEG) (a very rare allergy) is listed as a contraindication to the COVID-19 Pfizer vaccine.[81] Severe allergic reaction has been observed in approximately eleven cases per million doses of vaccine administered.[82][83] According to a report by the US Centers for Disease Control and Prevention, 71% of those allergic reactions happened within 15 minutes of vaccination and mostly (81%) among people with a documented history of allergies or allergic reactions.[82] The UK's Medicines and Healthcare products Regulatory Agency (MHRA) advised on 9 December 2020 that people who have a history of "significant" allergic reaction should not receive the Pfizer–BioNTech COVID‑19 vaccine.[84][85][86] On 12 December, the Canadian regulator followed suit, noting that: "Both individuals in the U.K. had a history of severe allergic reactions and carried adrenaline auto injectors. They both were treated and have recovered."[87]

According to Israel's Ministry of Health there is a probable relationship between the second dose and myocarditis in a small group of 16–30-year-old men. Between December 2020 and May 2021, there were 55 cases of myocarditis per 1 million people vaccinated, 95% of which were classified as mild.[88] Since April 2021, increased cases of myocarditis and pericarditis have been reported in the United States in about 13 per 1 million young people, mostly male and over the age of 16, after vaccination with the Pfizer–BioNTech or the Moderna vaccine.[89] Most affected individuals recover quickly with adequate treatment and rest.[90]

Pharmacology

The BioNTech technology for the BNT162b2 vaccine is based on use of nucleoside-modified mRNA (modRNA) which encodes a mutated form of the full-length spike protein found on the surface of the SARS-CoV-2 virus,[91] triggering an immune response against infection by the virus protein.[92]

Sequence

The modRNA sequence of the vaccine is 4,284 nucleotides long.[93] It consists of a five-prime cap; a five prime untranslated region derived from the sequence of human alpha globin; a signal peptide (bases 55–102) and two proline substitutions (K986P and V987P, designated "2P") that cause the spike to adopt a prefusion-stabilized conformation reducing the membrane fusion ability, increasing expression and stimulating neutralizing antibodies;[25][94] a codon-optimized gene of the full-length spike protein of SARS-CoV-2 (bases 103–3879); followed by a three prime untranslated region (bases 3880–4174) combined from AES and mtRNR1 selected for increased protein expression and mRNA stability[95] and a poly(A) tail comprising 30 adenosine residues, a 10-nucleotide linker sequence, and 70 other adenosine residues (bases 4175–4284).[93] The sequence contains no uridine residues; they are replaced by 1-methyl-3'-pseudouridylyl.[93] The 2P proline substitutions in the spike proteins were originally developed for a MERS vaccine by researchers at the National Institute of Allergy and Infectious Diseases' Vaccine Research Center, Scripps Research, and Jason McLellan's team (at the University of Texas at Austin, previously at Dartmouth College).[94]

Chemistry

In addition to the mRNA molecule, the vaccine contains the following inactive ingredients (excipients):[13][87][80]

The first four of these are lipids. The lipids and modRNA together form nanoparticles that act not only as carriers to get the modRNA into the human cells, but also as adjuvants.[96] ALC-0159 is a polyethylene glycol conjugate, i.e., a PEGylated lipid.[97]

Manufacturing

A US soldier holding the Pfizer–BioNTech vaccine

Pfizer and BioNTech are manufacturing the vaccine in their own facilities in the United States and in Europe. The license to distribute and manufacture the vaccine in China was purchased by Fosun, alongside its investment in BioNTech.[21][98]

Pfizer indicated in its 9 November 2020 press release that 50 million doses could be available by the end of 2020, with about 1.3 billion doses provided globally by 2021.[28]

Manufacturing the vaccine requires a three-stage process. The first stage involves the molecular cloning of DNA plasmids that code for the spike protein by infusing them into Escherichia coli bacteria. For all markets, this stage is conducted in the United States,[99] at a small Pfizer pilot plant in Chesterfield, Missouri[100][101] (near St. Louis). After four days of growth, the bacteria are killed and broken open, and the contents of their cells are purified over a week and a half to recover the desired DNA product. The DNA is bottled and frozen for shipment. Safely and quickly transporting the DNA at this stage is so important that Pfizer has used its company jet and helicopter to assist.[102]

The second stage is being conducted at a Pfizer plant in Andover, Massachusetts,[103] in the United States, and at BioNTech's plants in Germany.[99] The DNA is used as a template to build the desired mRNA strands,[102] which takes about four days.[99] Once the mRNA has been created and purified, it is frozen in plastic bags about the size of a large shopping bag, of which each can hold up to 10 million doses. The bags are placed on trucks which take them to the next plant.[102]

A Pfizer employee putting dry ice in a box to protect the COVID-19 vaccines during transport at the Puurs factory
Boxes containing the COVID‑19 vaccines at the Pfizer factory in Puurs
Inside view of Pfizer factory in Puurs

The third stage is being conducted at Pfizer plants in Portage, Michigan[104] (near Kalamazoo) in the United States, and Puurs in Belgium. This stage involves combining the mRNA with lipid nanoparticles, then filling vials, boxing vials, and freezing them.[102] Croda International subsidiary Avanti Polar Lipids is providing the requisite lipids.[105] As of November 2020, the major bottleneck in the manufacturing process is combining mRNA with lipid nanoparticles.[102] At this stage, it takes only four days to go from mRNA and lipids to finished vials, but each lot must then spend several weeks in deep-freeze storage while undergoing verification against 40 quality-control measures.[99]

Before May 2021,[106] the Pfizer plant in Puurs was responsible for all vials for destinations outside the United States.[99] Therefore, all doses administered in the Americas outside of the United States before that point in time required at least two transatlantic flights (one to take DNA to Europe and one to bring back finished vaccine vials).[99]

In February 2021, BioNTech announced it would increase production by more than 50% to manufacture 2 billion doses in 2021,[107] raised again at the end of March to 2.5 billion doses in 2021.[49]

In February 2021, Pfizer revealed that the entire sequence initially took about 110 days on average from start to finish, and that the company is making progress on reducing the time to 60 days.[108] More than half the days in the production process are dedicated to rigorous testing and quality assurance at each of the three stages.[108] Pfizer also revealed that the process requires 280 components and relies upon 25 suppliers located in 19 different countries.[99]

Vaccine manufacturers normally take several years to optimize the process of making a particular vaccine for speed and cost-effectiveness before attempting large-scale production.[108] Due to the urgency presented by the COVID‑19 pandemic, Pfizer and BioNTech began production immediately with the process by which the vaccine had been originally formulated in the laboratory, then started to identify ways to safely speed up and scale up that process.[108]

Syringes containing Pfizer COVID-19 vaccine doses

BioNTech announced in September 2020, that it had signed an agreement to acquire a manufacturing facility in Marburg, Germany, from Novartis to expand their vaccine production capacity.[109] Once fully operational, the facility would produce up to 750 million doses per year, or more than 60 million doses per month. The site will be the third BioNTech facility in Europe that produces the vaccine, while Pfizer operates at least four production sites in the United States and Europe.[109]

The Marburg facility had previously specialized in cancer immunotherapy for Novartis.[110] By the end of March 2021, BioNTech had finished retrofitting the facility for mRNA vaccine production and retraining its 300 staff, and obtained approval to begin manufacturing.[110] Besides making mRNA, the Marburg facility also performs the step of combining mRNA with lipids to form lipid nanoparticles, then ships the vaccine in bulk to other facilities for fill and finish (i.e., filling and boxing vials).[110]

On 23 April 2021, the EMA authorised an increase in batch size and associated process scale up at Pfizer's plant in Puurs. This increase is expected to have a significant impact on the supply of the vaccine in the European Union.[111][112]

At the end of April 2021, it was reported that Pfizer had started to export vaccine doses to Mexico and Canada from the Kalamazoo plant, which is much closer geographically to both countries than the Puurs plant.[106]

Logistics

The vaccine is delivered in vials that, once diluted, contain 2.25 ml (0.076 US fl oz) of vaccine, comprising 0.45 ml (0.015 US fl oz) frozen and 1.8 ml (0.061 US fl oz) diluent.[113] According to the vial labels, each vial contains five 0.3 ml (0.010 US fl oz) doses, however excess vaccine may be used for one, or possibly two, additional doses.[113][114] The use of low dead space syringes to obtain the additional doses is preferable, and partial doses within a vial should be discarded.[113][115] The Italian Medicines Agency officially authorized the use of excess doses remaining within single vials.[116] The Danish Health Authority allows mixing partial doses from two vials.[117] As of 8 January 2021, each vial contains six doses.[80][118][119][115] In the United States, vials will be counted as five doses when accompanied by regular syringes and as six doses when accompanied by low dead space syringes.[120]

The Pfizer–BioNTech vaccine must be kept at extremely low temperatures to ensure effectiveness, roughly between −80 and −60 °C (−112 and −76 °F).

The vaccine can stored at 2 to 8 °C (36 to 46 °F) for thirty days before use[121][122] and at 25 °C (77 °F)[13][15] or 30 °C (86 °F) [123][124] for up to two hours before use. During distribution the vaccine is stored in special containers that maintain temperatures between −80 and −60 °C (−112 and −76 °F).[50]

Low-income countries have limited cold chain capacity for ultracold transport and storage of a vaccine.[125] The necessary storage temperatures for the vaccine[50][126][125][127][128] are much lower than for the similar Moderna vaccine. The head of Indonesia's Bio Farma Honesti Basyir said purchasing the vaccine is out of the question for the world's fourth-most populous country, given that it did not have the necessary cold chain capability. Similarly, India's existing cold chain network can handle only temperatures between 2 and 8 °C (36 and 46 °F), far above the requirements of the vaccine.[129][130]

History

Before COVID‑19 vaccines, a vaccine for an infectious disease had never before been produced in less than several years, and no vaccine existed for preventing a coronavirus infection in humans.[131] The SARS-CoV-2 virus, which causes COVID‑19, was detected in December 2019,[132] and BioNTech began development of a COVID‑19 vaccine on 10 January 2020, when the SARS-CoV-2 genetic sequences were released by the Chinese Center for Disease Control and Prevention via GISAID,[35][133][134] triggering an urgent international response to prepare for an outbreak and hasten development of preventive vaccines.[135][136]

The vaccine's development began when BioNTech founder Uğur Şahin read an article in the medical journal The Lancet that convinced him the COVID‑19 coronavirus in China would soon become a global pandemic, so he called for scientists at the company to cancel their vacations and start development of a COVID‑19 vaccine in January 2020.[137] BioNTech started its program 'Project Lightspeed' to develop a vaccine against the new COVID‑19 virus based on its already established mRNA-technology,[32] which they had been developing since leading mRNA researcher Katalin Karikó joined the company in 2013.[138] Several variants of the vaccine were created in their laboratories in Mainz, and 20 of those were presented to experts of the Paul Ehrlich Institute in Langen.[139]

Funding

According to Pfizer, research and development for the vaccine cost close to US$1 billion.[140]

BioNTech received a US$135 million investment from Fosun in March 2020, in exchange for 1.58 million shares in BioNTech and the future development and marketing rights of BNT162b2 in China.[141][98]

In April 2020, BioNTech signed a partnership with Pfizer and received $185 million, including an equity investment of approximately $113 million.[142][143][144]

In June 2020, BioNTech received €100 million (US$119 million) in financing from the European Commission and European Investment Bank.[145] The Bank's deal with BioNTech started early in the pandemic, when the Bank's staff reviewed its portfolio and came up with BioNTech as one of the companies capable of developing a COVID‑19 vaccine. The European Investment Bank had already signed a first transaction with BioNTech in 2019.[146][147]

In September 2020, the German government granted BioNTech €375 million (US$445 million) for its COVID‑19 vaccine development program.[148]

Pfizer CEO Albert Bourla said he decided against taking funding from the US government's Operation Warp Speed for the development of the vaccine "because I wanted to liberate our scientists [from] any bureaucracy that comes with having to give reports and agree how we are going to spend the money in parallel or together, etc." Pfizer did enter into an agreement with the US for the eventual distribution of the vaccine, as with other countries.[149]

Clinical trials

Phase I–II Trials were started in Germany on 23 April 2020, and in the U.S. on 4 May 2020, with four vaccine candidates entering clinical testing.[26][32] The vaccine candidate BNT162b2 was chosen as the most promising among three others with similar technology developed by BioNTech.[92] Before choosing BNT162b2, BioNTech and Pfizer had conducted Phase I trials on BNT162b1 in Germany and the United States, while Fosun performed a Phase I trial in China. In these Phase I studies, BNT162b2 was shown to have a better safety profile than the other three BioNTech candidates.[150][25][151][152]

The Pivotal Phase II–III Trial with the lead vaccine candidate "BNT162b2" began in July. Preliminary results from Phase I–II clinical trials on BNT162b2, published in October 2020, indicated potential for its safety and efficacy.[25] During the same month, the European Medicines Agency (EMA) began a periodic review of BNT162b2.[153]

The study of BNT162b2 is a continuous-phase trial in Phase III as of November 2020.[26] It is a "randomized, placebo-controlled, observer-blind, dose-finding, vaccine candidate-selection, and efficacy study in healthy individuals".[26] The study expanded during mid-2020 to assess efficacy and safety of BNT162b2 in greater numbers of participants, reaching tens of thousands of people receiving test vaccinations in multiple countries in collaboration with Pfizer and Fosun.[28][98]

The Phase III trial assesses the safety, efficacy, tolerability, and immunogenicity of BNT162b2 at a mid-dose level (two injections separated by 21 days) in three age groups: 12–15 years, 16–55 years or above 55 years.[26] The Phase III results indicating a 95% efficacy of the developed vaccine were published on 18 November 2020.[32] For approval in the EU, an overall vaccine efficacy of 95% was confirmed by the EMA.[154] The EMA clarified that the second dose should be administered three weeks after the first dose.[155]

Cumulative incidence curves for symptomatic COVID‑19 infections after the first dose of the Pfizer–BioNTech vaccine (tozinameran) or placebo in a double-blind clinical trial. (red: placebo; blue: tozinameran)[156]

At 14 days after dose 1, the cumulative incidence begins to diverge between the vaccinated group and the placebo group. The highest concentration of neutralizing antibodies is reached 7 days after dose 2 in younger adults and 14 days after dose 2 in older adults.[154]

Vaccine efficacy against confirmed symptomatic COVID‑19[154]
Endpoint subgroup Efficacy (95% confidence interval)
All ages 95.0% (90.097.9%)
Age 12–17 Not estimable, no cases in placebo group
Age 18–64 95.1% (89.698.1%)
Age 65–74 92.9% (53.199.8%)
Age ≥75 100.0% (−13.1 to 100.0%)
All ages, after dose 1, before dose 2 52.4% (29.568.4%)
All ages, ≥10 days after dose 1, before dose 2 86.7% (68.695.4%)
All ages, <7 days after dose 2 90.5% (61.098.9%)
All ages, ≥7 days after dose 2 94.8% (89.897.6%)
All ages, USA 94.9% (88.698.2%)
All ages, Argentina 97.2% (83.399.9%)
All ages, Brazil 87.7% (8.199.7%)

The ongoing Phase III trial, which is scheduled to run from 2020 to 2022, is designed to assess the ability of BNT162b2 to prevent severe infection, as well as the duration of immune effect.[28][157][126]

High antibody activity persists for at least three months after the second dose, with an estimated antibody half-life of 55 days. From these data, one study suggested that antibodies might remain detectable for around 554 days.[158]

Preliminary results from a multinational clinical trial indicate that vaccine efficacy against symptomatic disease decreases from 96% (95% CI, 9398%) to 84% (7590%) four months after the second dose.[159]

Specific populations

Pfizer and BioNTech started a Phase II–III randomized control trial in healthy pregnant women 18 years of age and older (NCT04754594).[160] The study will evaluate 30 µg of BNT162b2 or placebo administered via intramuscular injection in two doses, 21 days apart. The Phase II portion of the study will include approximately 350 pregnant women randomized 1:1 to receive BNT162b2 or placebo at 27 to 34 weeks' gestation. The Phase III portion of this study will assess the safety, tolerability, and immunogenicity of BNT162b2 or placebo among pregnant women enrolled at 24 to 34 weeks' gestation. Pfizer and BioNTech announced on 18 February 2021 that the first participants received their first dose in this trial.[161]

A study published in March 2021, in the American Journal of Obstetrics and Gynecology came to the conclusion that messenger RNA vaccines against the novel coronavirus, such as the Pfizer-BioNTech and Moderna vaccines were safe and effective at providing immunity against infection to pregnant and breastfeeding mothers. Furthermore, they found that naturally occurring antibodies created by the mother's immune system were passed on to their children via the placenta and/or breastmilk, thus resulting in passive immunity among the child, effectively giving the child protection against the disease. The study also found that vaccine-induced immunity among the study's participants was stronger in a statistically significant way over immunity gained through recovery from a natural COVID‑19 infection. In addition, the study reported that the occurrence and intensity of potential side effects in those undergoing pregnancy or lactating was very similar to those expected from non-pregnant populations, remaining generally very minor and well tolerated, mostly including injection site soreness, minor headaches, muscles aches or fatigue for a short period of time.[162]

In January 2021, Pfizer said it had finished enrolling 2,259 children aged between 12 and 15 years to study the vaccine's safety and efficacy.[163] On 31 March 2021, Pfizer and BioNTech announced from initial Phase III trial data that the vaccine is 100% effective for those aged 12 to 15 years of age, with trials for those younger still in progress.[164]

A research letter published in JAMA reported that the vaccines appeared to be safe for immunosuppressed organ transplant recipients, but that the resulting antibody response was considerably poorer than in the non-immunocompromised population after only one dose. The paper admitted the limitation of only reviewing the data following the first dose of a two-dose cycle vaccine.[165]

Authorizations

  Full authorization
  Emergency authorization
  Eligible COVAX recipient

Expedited

The United Kingdom's Medicines and Healthcare products Regulatory Agency (MHRA) gave the vaccine "rapid temporary regulatory approval to address significant public health issues such as a pandemic" on 2 December 2020, which it is permitted to do under the Medicines Act 1968.[39] It is the first COVID‑19 vaccine to be approved for national use after undergoing large scale trials,[166] and the first mRNA vaccine to be authorized for use in humans.[39][167] The United Kingdom thus became the first Western country to approve a COVID‑19 vaccine for national use,[168] although the decision to fast-track the vaccine was criticised by some experts.[169]

After the United Kingdom, the following countries and regions expedited processes to approve the Pfizer–BioNTech COVID‑19 vaccine for use: Argentina,[170] Australia,[171] Bahrain,[172] Canada,[173][174] Chile,[175] Costa Rica,[176] Ecuador,[175] Hong Kong,[177] Iraq,[178] Israel,[179] Jordan,[180] Kuwait,[181] Malaysia,[182] Mexico,[183][184] Oman,[185] Panama,[186] the Philippines,[187] Qatar,[188] Saudi Arabia,[189][190][191] Singapore,[192][193][194] South Korea,[195][196] the United Arab Emirates,[197] the United States,[198] and Vietnam.[199]

The World Health Organization (WHO) authorized it for emergency use.[200][201]

In the United States, an emergency use authorization (EUA) is "a mechanism to facilitate the availability and use of medical countermeasures, including vaccines, during public health emergencies, such as the current COVID‑19 pandemic", according to the FDA.[202] Pfizer applied for EUA on 20 November 2020[203] and the FDA approved the application three weeks later on 11 December 2020. The United States Centers for Disease Control and Prevention (CDC) Advisory Committee on Immunization Practices (ACIP) approved recommendations for vaccination of those aged sixteen years or older.[204][205] Following the EUA issuance, BioNTech and Pfizer continued the Phase III clinical trial to finalize safety and efficacy data, leading to application for licensure (approval) of the vaccine in the United States.[202][16][113] On 10 May 2021, the US FDA also authorized the vaccine for people aged 12 to 15 under an expanded EUA.[206][16][113][207][114] The FDA recommendation was endorsed by the ACIP and adopted by the CDC on 12 May 2021.[208][209]

On 16 February 2021, the South African Health Products Regulatory Authority (SAHPRA) in South Africa issues Section 21, Emergency Use Approval for the vaccine.[210][211]

On 31 March 2021, the Turkish ministry of health gave Emergency Use Approval for the vaccine.[citation needed]

On 5 May 2021, Health Canada authorized the vaccine for people aged 12 to 15.[22][212] On 18 May 2021, Singapore's Health Sciences Authority authorized the vaccine for people aged 12 to 15.[213] The European Medicines Agency followed suit on 28 May 2021.[214]

On 4 June 2021, the UK Medicines and Healthcare products Regulatory Agency (MHRA) came to a similar decision and approved the use of the vaccine for people twelve years of age and older.[13][75][76]

Standard

On 19 December 2020, the Swiss Agency for Therapeutic Products (Swissmedic) approved the Pfizer–BioNTech COVID‑19 vaccine for regular use, two months after receiving the application, saying the vaccine fully complied with the requirements of safety, efficacy and quality.[2][215] This is the first authorization under a standard procedure.[2][215]

On 21 December 2020, the Committee for Medicinal Products for Human Use (CHMP) of the European Medicines Agency (EMA) recommended granting conditional marketing authorization for the Pfizer–BioNTech COVID‑19 vaccine under the brand name Comirnaty.[3][216][217] The recommendation was accepted by the European Commission the same day.[216][218]

On 23 February 2021, the Brazilian Health Regulatory Agency approved the Pfizer–BioNTech COVID‑19 vaccine under its standard marketing authorization procedure.[219][220][221][222] In June 2021, the approval was extended to those aged twelve or over.[223][224]

In July 2021, the U.S. Food and Drug Administration (FDA) granted priority review designation for the biologics license application (BLA) for the Pfizer–BioNTech COVID-19 vaccine with a goal date for the decision in January 2022.[225][226] On 23 August 2021, the FDA approved the vaccine for use for those aged sixteen years and older.[5][45][46]

The Pfizer-BioNTech Comirnaty COVID-19 vaccine was authorized in Canada on 16 September 2021, for people aged 12 and older.[11][12][10][227]

Further development

Homologous prime-boost vaccination

On 29 July 2021, Israel's Prime Minister announced that the country was rolling out a third dose of the Pfizer-BioNTech vaccine to people over the age of 60, based on data that suggested significant waning immunity from infection over time for those with two doses.[228] The country expanded the availability to all Israelis over the age of 12, after five months since their second shot. On 29 August 2021, Israel's coronavirus czar announced that Israelis who had not received a booster shot within six months of their second dose would lose access to the country's green pass vaccine passport.[229] Studies performed in Israel found that a third dose reduced the incidence of serious illness.[60]

On 18 August 2021, the United States Department of Health and Human Services announced a plan to offer a booster dose eight months after the second dose, citing evidence of reduced protection against mild and moderate disease and the possibility of reduced protection against severe disease, hospitalization, and death.[230] The US Food and Drug Administration (FDA) and the Centers for Disease Control and Prevention (CDC) authorized the use of an additional mRNA vaccine dose for immunocompromised individuals at that time.[57][58] Scientists and the WHO noted in August 2021 the lack of evidence on the need for a booster dose for healthy people and that the vaccine remains effective against severe disease months after administration.[55] In a statement, the WHO and SAGE said that, while protection against infection may be diminished, protection against severe disease will likely be retained due to cell-mediated immunity.[56] Research into optimal timing for boosters is ongoing, and a booster too early may lead to less robust protection.[231]

On 23 September 2021, the FDA and CDC authorization was extended to provide a third shot for other specific groups.[232][233][234]

On 4 October 2021, the European Medicines Agency (EMA) stated that a booster shot of the vaccine could be given to healthy people, aged 18 years and older, at least six months after their second dose.[235] It also stated that people with "severely weakened" immune systems can receive an extra dose of either the Pfizer-BioNTech vaccine or the Moderna vaccine starting at least 28 days after their second dose.[235] The final approval to provide booster shots in the European Union will be decided by each national government.[236]

Heterologous prime-boost vaccination

Society and culture

Brand names

BNT162b2 was the code name during development and testing,[25][35] tozinameran is the recommended international nonproprietary name (INN),[237] and Comirnaty is the brand name.[2][3] According to BioNTech, the name Comirnaty "represents a combination of the terms COVID‑19, mRNA, community, and immunity".[1][238]

The vaccine also may be distributed in packaging with the name "Pfizer–BioNTech COVID‑19 Vaccine" in the United States.[4]

Economics

Pfizer reported revenue of US$154 million from the BNT162b2 vaccine in 2020.[144]

In July 2020, the vaccine development program Operation Warp Speed placed an advance order of US$1.95 billion with Pfizer to manufacture 100 million doses of a COVID‑19 vaccine for use in the United States if the vaccine was shown to be safe and effective.[21][239][240][241][242] By mid-December 2020, Pfizer had agreements to supply 300 million doses to the European Union,[243] 120 million doses to Japan,[244] 40 million doses (10 million before 2021) to the United Kingdom,[126] 20 million doses to Canada,[245] an unspecified number of doses to Singapore,[246] and 34.4 million doses to Mexico.[247] Fosun also has agreements to supply 10 million doses to Hong Kong and Macau.[248] The Hong Kong government said it would receive its first batch of 1 million doses by the first quarter of 2021.[249]

BioNTech and Fosun agreed to supply China with a batch of 100 million doses in 2021, subject to regulatory approval.[250][251] The initial supply will be delivered from BioNTech's production facilities in Germany.[250][251]

On 8 December 2020, Margaret "Maggie" Keenan, 90, from Fermanagh, became the first person to receive the vaccine outside of a clinical trial.[252] In a notable example of museums documenting the pandemic, the vial and syringe used for that first dose were saved and acquired by The Science Museum in London for its permanent collection.[253] By 20 December, 521,594 UK residents had received the vaccine as part of the national vaccination programme. 70% of the recipients were people aged 80 or over.[254]

On 23 December, a Lucerne resident, a 90-year-old woman, became the first person to receive the vaccine in Switzerland.[255] This marked the beginning of mass vaccination in continental Europe.[256]

In January 2021, Pfizer and BioNTech offered to supply 50 million doses of COVID‑19 vaccine for health workers across Africa between March and the end of 2021, at a discounted price of US$10 per dose.[257] In response South Africa has secured 20 million doses expected to be delivered in consignments after March.[258]

On 23 April 2021, the European Union announced a third contract with Pfizer-BioNTech for up to 1.8 billion doses of the companies' mRNA vaccine for distribution within two years.[259]

On 6 May 2021, the International Olympic Committee purchased doses from Pfizer-BioNTech to help immunize volunteers, staff, and participating athletes during the 2020 Summer Olympics which took place in July 2021 in Tokyo.[260] President Joe Biden's administration pledged on 9 June 2021 to distribute 500 million doses of the Pfizer-BioNTech vaccine among approximately 100 countries over the course of the upcoming year.[261]

Misinformation

Videos on video-sharing platforms circulated around May 2021 showing people having magnets stick to their arms after receiving the vaccine, purportedly demonstrating the conspiracy theory that vaccines contain microchips, but these videos have been debunked.[262][263][264][265]

Notes

  1. ^ According to the British National Formulary and MedDRA conventions, side effects are "very common" when they occur in more than 1 in 10 instances; "common", 1 in 100 to 1 in 10; "uncommon", 1 in 1,000 to 1 in 100; "rare", 1 in 10,000 to 1 in 1,000; and "very rare" when they occur in less than 1 in 10,000 instances.[37]
  1. ^ This is a type of study where researchers recruit two groups: people who test positive for the disease (cases) and those who test negative (controls) (Vandenbroucke 2019). They then survey these individuals for factors which may have affected whether or not they developed the disease (in this case, vaccination status) (Patel 2020). In the case of Lopez Bernal et al, they also assessed which variant each "case" contracted (e.g. alpha [B.1.1.7] or delta [B.1.617.2]) using both RT-PCR testing and whole genome sequencing. To evaluate efficacy, the researchers determined how much less likely a person was to contract each variant based on their vaccination status. In this case, a person who received two doses of the Pfizer vaccine was 93.7% less likely to contract the alpha variant and 88.0% less likely to contract the delta variant, when compared to an unvaccinated person.
    • Vandenbroucke JP, Pearce N (November 2019). "Test-Negative Designs: Differences and Commonalities with Other Case-Control Studies with "Other Patient" Controls" (PDF). Epidemiology. 30 (6): 838–844. doi:10.1097/EDE.0000000000001088. PMID 31430265. S2CID 201117050.
    • Patel MM, Jackson ML, Ferdinands J (November 2020). "Postlicensure Evaluation of COVID-19 Vaccines". JAMA. 324 (19): 1939–1940. doi:10.1001/jama.2020.19328. PMID 33064144. S2CID 222819843. Retrieved 12 August 2021.

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Further reading

External links