Wastewater-based epidemiology
Wastewater-based epidemiology (or wastewater-based surveillance or sewage chemical-information mining) analyzes
History
Wastewater-based epidemiology (WBE) can be applied in the field of research that uses the analysis of sewage and wastewater to monitor the presence, distribution, and prevalence of a disease or chemicals in communities. The technique has been used for several decades, and an example of its early application is in the 1940s when WBE was applied for the detection and distribution of poliovirus in the sewage of New York, Chicago, and other cities.[4] Another early application came in 1954, in a study of schistosome of snails.[5] Wastewater-based epidemiology thereafter spread to multiple countries. By the turn of the 21st century, numerous studies had adopted the technique.[6] A 2005 study measured cocaine and its metabolite benzoylecgonine in water samples from the River Po in Italy.[7]
Wastewater-based epidemiology is supported by government bodies such as the European Monitoring Centre for Drugs and Drug Addiction in Europe.[8] Similar counterparts in other countries, such as the Australian Criminal Intelligence Commission in Australia[9] and authorities in China[10] use wastewater-based epidemiology to monitor drug use in their populations.
As of 2022, WBE had reached 3,000 sites in 58 countries.[11]
A group of Chinese scientists published the first WBE study on SARS-CoV-2 in 2020. They assessed whether the virus was present in fecal samples among 74 patients hospitalized for COVID-19 between January 16 and March 15, 2020, at a Chinese hospital. The first US SARS-CoV-2 study came from Boston. It reported a far higher rate of infection than had been estimated from individual PCR testing. It also served as a warning system, alerting the public to outbreaks (and outbreak ends) before positive test rates changed. However, considerable variability has been found within populations, based on symptom profiles, which may compromise measurement accuracy as the pathogen evolves.[12]
Technique
Wastewater-based epidemiology is analogous to
where R is the concentration of a residue in a wastewater sample, F is the volume of wastewater that the sample represents, C is a correction factor which reflects the average mass and molar excretion fraction of a parent drug or a metabolite, and P is the number of people in a wastewater catchment. Variations or modifications may be made to C to account for other factors such as the degradation of a chemical during its transport in the sewer system.[2]
Applications
Commonly detected chemicals include, but are not limited to the following;[13][2]
- Cocaine
- Amphetamine
- Methamphetamine
- Methylone
- Ecstasy
- Heroin
- Alcohol
- Nicotine
- Caffeine
- Ketamine
- Opioids
- Antidepressants
- Antipsychotics
- Antimicrobials
- Antihistamines
- Aritificial sweeteners
Temporal comparisons
By analyzing samples taken across different time points, day-to-day or longer-term trends can be assessed. This approach has illustrated trends such as increased consumption of alcohol and recreational drugs on weekends compared to weekdays.[13] A temporal wastewater-based epidemiology study in Washington measured wastewater samples in Washington before, during and after cannabis legalisation. By comparing cannabis consumption in wastewater with sales of cannabis through legal outlets, the study showed that the opening of legal outlets led to a decrease in the market share of the illegal market.[15]
Spatial comparisons
Differences in chemical consumption amongst different locations can be established when comparable methods are used to analyse wastewater samples from different locations. The European Monitoring Centre for Drugs and Drug Addiction conducts regular multi-city tests in Europe to estimate the consumption of illegal drugs. Data from these monitoring efforts are used alongside more traditional monitoring methods to understand geographical changes in drug consumption trends.[8]
Microbial surveillance
Virus surveillance
Sewage can also be tested for signatures of
Applications against major outbreaks
It is unclear how cost-effective wastewater surveillance is, but national coordination and standardized methods could be useful.[41] Less common infections may be difficult to detect, including, such as those that cause hepatitis or foodborne illness.[42] A warning of increased cases from wastewater surveillance can "provide health departments with critical lead time for making decisions about resource allocation and preventive measures" and "unlike testing of individual people, wastewater testing provides insights into the entire population within a catchment area".[43]
A 2023 report by the
Antimicrobial resistance
In 2022, genomic epidemiologists reported results from a global survey of antimicrobial resistance (AMR) via genomic wastewater-based epidemiology, finding large regional variations, providing maps, and suggesting resistance genes are also passed on between microbial species that are not closely related.[46][45] A 2023 review on wastewater-based epidemiology opined the necessity of surveillance wastewater from farms with livestock, wet markets and surrounding areas given the greater risk of pathogen spillover to humans.[47]
See also
References
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- ^ a b "Wastewater analysis and drugs: a European multi-city study" (PDF). European Monitoring Centre for Drugs and Drug Addiction. 12 March 2020. Archived from the original (PDF) on 17 November 2020. Retrieved 31 August 2020.
- ^ "National Wastewater Drug Monitoring Program reports". Australian Criminal Intelligence Commission. 30 June 2020. Archived from the original on 20 September 2020. Retrieved 2 July 2020.
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- ^ "ArcGIS Dashboards: Summary of Global SARS-CoV-2 Wastewater Monitoring Efforts by UC Merced Researchers". www.arcgis.com. Retrieved 2022-02-09.
- ^ Jetelina, Katelyn (2022-02-09). "Wastewater: Taking surveillance to the next level". Your Local Epidemiologist. Retrieved 2022-02-09.
- ^ ISBN 978-92-9168-856-2. Archived from the original (PDF) on 2020-11-06. Retrieved 2020-08-31.)
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- ^ "Wastewater surveillance becomes more targeted in search for poliovirus, monkeypox and coronavirus". CBS News. Retrieved 18 September 2022.
- ^ Payne, Aaron; Kreidler, Mark (8 August 2022). "COVID sewage surveillance labs join the hunt for monkeypox". WOUB Public Media. Retrieved 18 September 2022.
- ^ McPhillips, Deidre (18 May 2022). "Covid-19 wastewater surveillance is promising tool, but critical challenges remain". CNN. Retrieved 2 February 2023.
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