Legionella

Source: Wikipedia, the free encyclopedia.

Legionella
Legionella sp. under UV light
Scientific classification Edit this classification
Domain: Bacteria
Phylum: Pseudomonadota
Class: Gammaproteobacteria
Order: Legionellales
Family: Legionellaceae
Brenner et al. 1979
Genus: Legionella
Brenner et al. 1979
Species

Legionella is a genus of pathogenic gram-negative bacteria that includes the species L. pneumophila, causing legionellosis[3] (all illnesses caused by Legionella) including a pneumonia-type illness called Legionnaires' disease and a mild flu-like illness called Pontiac fever.[3]

Legionella may be visualized with a

silver stain or cultured in cysteine-containing media such as buffered charcoal yeast extract agar. It is common in many environments, including soil and aquatic systems, with at least 50 species and 70 serogroups identified. These bacteria, however, are not transmissible from person to person;[4] Furthermore, most people exposed to the bacteria do not become ill.[5] Most outbreaks are traced to poorly maintained cooling towers
.

The

O antigen
determinants, which are essential means of serologically classifying many gram-negative bacteria.

Legionella acquired its name after

veterans. The convention occurred in Philadelphia during the U.S. Bicentennial year on July 21–24, 1976. This epidemic among U.S. war veterans, occurring in the same city as—and within days of the 200th anniversary of—the signing of the Declaration of Independence, was widely publicized and caused great concern in the United States.[6]
On January 18, 1977, the causative agent was identified as a previously unknown bacterium subsequently named Legionella.

Detection

Legionella is traditionally detected by culture on

dipslides. Common laboratory procedures for the detection of Legionella in water[7] concentrate the bacteria (by centrifugation and/or filtration through 0.2-μm filters) before inoculation onto a charcoal yeast extract agar containing selective agents (e.g. glycine, vancomycin, polymixin, cyclohexamide, GVPC) to suppress other flora in the sample. Heat or acid treatment are also used to reduce interference from other microbes in the sample.[8]

After incubation for up to 10 days, suspect colonies are confirmed as Legionella if they grow on buffered charcoal yeast extract agar containing cysteine, but not on agar without cysteine added.

Immunological techniques are then commonly used to determine the species and/or serogroups of bacteria present in the sample.[4]

Although the plating method is quite specific for most species of Legionella, one study has shown that a coculture method that accounts for the close relationship with amoebae may be more sensitive, since it can detect the presence of the bacteria even when masked by their presence inside the amoebae.[9] Consequently, the clinical and environmental prevalences of the bacteria are likely to be underestimated due to the current laboratory methodology.[citation needed]

Many hospitals use the Legionella urinary antigen test for initial detection when Legionella pneumonia is suspected. Some of the advantages offered by this test are that the results can be obtained in hours rather than the several days required for culture, and that a urine specimen is generally more easily obtained than a sputum specimen. Disadvantages are that the urine antigen test only detects antigen of Legionella pneumophila serogroup 1 (LP1); only a culture will detect infection by non-LP1 strains or other Legionella species and that isolates of Legionella are not obtained, which impairs public health investigations of outbreaks.[10]

New techniques for the rapid detection of Legionella in water samples have been developed, including the use of polymerase chain reaction and rapid immunological assays. These technologies can typically provide much faster results.[11]

Government public-health surveillance has demonstrated increasing proportions of drinking water–associated outbreaks, specifically in healthcare settings.[12]

Analyses of genome sequences from Legionellales have identified 24 conserved signature indels (CSIs) in diverse proteins including 30S ribosomal protein S8, periplasmic serine endoprotease DegP precursor, DNA polymerase I, and ABC transporter permease, etc. that are specifically present in different species from the genus Legionella.[13] These molecular signatures provide novel and reliable means for distinguishing members of the genus Legionella from all other bacteria and for their diagnostics.[citation needed]

Pathogenesis

A Legionella pneumophila bacterium (green) caught by a Vermamoeba vermiformis amoeba (orange)

In the natural environment, Legionella lives within amoebae such as Acanthamoeba spp., Naegleria spp., Vermamoeba spp., or other protozoa such as Tetrahymena pyriformis.[14]

Upon inhalation, the bacteria can infect alveolar macrophages, where they can replicate. This results in Legionnaires' disease and the less severe illness Pontiac fever. Legionella transmission is via inhalation of water droplets from a contaminated source that has allowed the organism to grow and spread (e.g., cooling towers). Transmission also occurs less commonly via aspiration of drinking water from an infected source. Person-to-person transmission has not been demonstrated,[4] though it could be possible in rare cases.[15]

Once inside a host, the incubation period may be up to two weeks.

hospital-acquired disease due to Legionella infection.[16] According to Infection Control and Hospital Epidemiology, hospital-acquired Legionella pneumonia has a fatality rate of 28%, and the source is the water distribution system.[17]

Legionella species typically exist in nature at low concentrations, in groundwater, lakes, and streams. They reproduce after entering man-made equipment, given the right environmental conditions.[18] In the United States, the disease affects between 8,000 and 18,000 individuals a year.[19]

Sources

Documented sources include cooling towers,[20] swimming pools (especially in Scandinavian countries), domestic water systems and showers, ice-making machines,[21] refrigerated cabinets, whirlpool spas,[22][23] hot springs,[24] fountains,[25] dental equipment,[26] soil,[27] automobile windshield washer fluid,[28] industrial coolant,[29] and waste water treatment plants.

Airborne transmission

The largest[30] and one of the most common source of Legionnaires' disease outbreaks are cooling towers (heat rejection equipment used in air conditioning and industrial cooling water systems) primarily because of the risk for widespread circulation. Many governmental agencies, cooling tower manufacturers, and industrial trade organisations have developed design and maintenance guidelines for controlling the growth and proliferation of Legionella within cooling towers.[31][32]

Research in the Journal of Infectious Diseases (2006) provided evidence that L. pneumophila, the causative agent of Legionnaires' disease, can travel at least 6 km from its source by airborne spread. It was previously believed that transmission of the bacterium was restricted to much shorter distances. A team of French scientists reviewed the details of an epidemic of Legionnaires' disease that took place in Pas-de-Calais, northern France, in 2003–2004. Of 86 confirmed cases during the outbreak, 18 resulted in death. The source of infection was identified as a cooling tower in a petrochemical plant, and an analysis of those affected in the outbreak revealed that some infected people lived as far as 6–7 km from the plant.[33]

Because of these risks, a UK legal mandate requires owners to notify the local authorities of any cooling towers a company operates.[34]

Recreational exposure

As outlined above, cooling towers are well established as sources of Legionella that may have an effect on community exposure to the bacterium and Legionnaires' disease epidemics.[35] In addition to cooling towers, use of swimming pools, spa pools, and other recreational water bodies has also been shown to increase risk of exposure to Legionella, though this differs by species of Legionella.[36] In a review of disease caused by recreational exposure to Legionella, most exposures occurred in spas or pools used by the public (hotels or recreational centers) or in natural settings (hot springs or thermal water).[36]

Hotels and other tourist destinations have contributed to Legionella exposure.[37] Relative danger at commonly used facilities with heating and cooling water systems depends on several factors, such as the water source, how much Legionella is present (if there is any), if and how the water system is treated, how people are interacting with this water, and other factors that make the water systems so dynamic.[37]

In addition to tourists and other recreators, gardeners may be at increased risk for exposure to Legionella.[38] In some countries (like Australia), Legionella lives in soil and compost.[38] Warmer temperatures and increased rainfall in some regions of the world due to climate change may impact Legionella in soil, gardeners seasonal exposure to contaminated soil, and complex water systems used by the public.[38]

Exposure related to natural disasters and climate change

Not only are Legionella spp. present in man-made water systems and infrastructure, but this bacteria also lives in natural bodies of water, such as lakes and rivers.[36] Weather patterns and other environmental factors may increase risk of Legionella outbreaks; a study in Minnesota, USA, using outbreak information from 2011 to 2018 showed precipitation as having the greatest effect of increasing risk of Legionella exposure when taking into account other environmental factors (temperature, relative humidity, land use and age of infected person).[39] Weather patterns heavily relate to the established infrastructure and water sources, especially in urban settings. In the US, most cases of Legionella infection have occurred in the summertime, though they were likely more associated with rainfall and humidity than summer temperatures.[38] Severe rain patterns can increase risk of water source contamination through flooding and unseasonable rains; therefore, natural disasters, especially those associated with climate change, may increase risk of exposure to Legionella.[38]

Vaccine research

No vaccine is available for legionellosis.[40][41] Vaccination studies using heat-killed or acetone-killed cells have been carried out in guinea pigs, which were then given Legionella intraperitoneally or by aerosol. Both vaccines were shown to give moderately high levels of protection. Protection was dose-dependent and correlated with antibody levels as measured by enzyme-linked immunosorbent assay to an outer membrane antigen and by indirect immunofluorescence to heat-killed cells.[42]

Molecular biology

Legionella has been discovered to be a genetically diverse species with 7-11% of genes strain-specific. The molecular function of some of the proven virulence factors of Legionella have been discovered.[43]

Legionella control and biomonitoring

A biomonitoring solution exists in a Legionella-specific aptamer-based assay. Control of Legionella growth can occur through chemical, thermal or ultraviolet treatment methods.[44]

Heat

One option is temperature control—i.e., keeping all cold water below 25 °C (77 °F) and all hot water above 51 °C (124 °F).[3]

Temperature affects the survival of Legionella as follows:[3]

  • Above 70 °C (158 °F) – Legionella dies almost instantly
  • At 60 °C (140 °F) – 90% die in 2 minutes (Decimal reduction time (D) = 2 minutes)
  • At 50 °C (122 °F) – 90% die in 80–124 minutes, depending on strain (D = 80–124 minutes)
  • 48 to 50 °C (118 to 122 °F) – can survive but do not multiply
  • 32 to 42 °C (90 to 108 °F) – ideal growth range
  • 25 to 45 °C (77 to 113 °F) – growth range
  • Below 20 °C (68 °F) – can survive, but are dormant

Other temperature sensitivity[45][46]

  • 60 to 70 °C (140 to 158 °F) to 80 °C (176 °F) – Disinfection range
  • 66 °C (151 °F) – Legionella dies within 2 minutes
  • 60 °C (140 °F) – Legionella dies within 32 minutes
  • 55 °C (131 °F) – Legionella dies within 5 to 6 hours

Water temperature can be monitored in real-time with electronic devices.[47]

Chlorine

A very effective chemical treatment is chlorine. For systems with marginal issues, chlorine provides effective results at >0.5 ppm[48] residual in the hot water system. For systems with significant Legionella problems, temporary shock chlorination—where levels are raised to higher than 2 ppm for a period of 24 hours or more and then returned to 0.5 ppm—may be effective.[49] Hyperchlorination can also be used where the water system is taken out of service and the chlorine residual is raised to 50 ppm or higher at all distal points for 24 hours or more. The system is then flushed and returned to 0.5 ppm chlorine prior to being placed back into service. These high levels of chlorine penetrate biofilm, killing both the Legionella bacteria and the host organisms. Annual hyperchlorination can be an effective part of a comprehensive Legionella preventive action plan.[50]

Copper-silver ionization

U.S. Environmental Protection Agency and WHO for Legionella control and prevention.[51][52] Copper and silver ion concentrations must be maintained at optimal levels, taking into account both water flow and overall water usage, to control Legionella. The disinfection function within all of a facility's water distribution network occurs within 30 to 45 days.[citation needed] Key engineering features such as 10 amps per ion chamber cell and automated variable voltage outputs having no less than 100 VDC are but a few of the required features for proper Legionella control and prevention, using a specific, nonreferenced copper-silver system. Swimming pool ion generators are not designed for potable water treatment.[citation needed
]

Questions remain whether the silver and copper ion concentrations required for effective control of symbiotic hosts could exceed those allowed under the U.S. Safe Drinking Water Act's Lead and Copper Rule. In any case, any facility or public water system using copper-silver for disinfection should monitor its copper and silver ion concentrations to ensure they are within intended levels – both minimum and maximum. Further, no current standards for silver in the EU and other regions allow use of this technology.[citation needed]

Copper-silver ionization is an effective process to control Legionella in potable water distribution systems found in health facilities, hotels, nursing homes, and most large buildings. However, it is not intended for cooling towers because of pH levels greater than 8.6, that cause ionic copper to precipitate. Furthermore, tolyltriazole, a common additive in cooling water treatment, could bind the copper making it ineffective. Ionization became the first such hospital disinfection process to have fulfilled a proposed four-step modality evaluation; by then, it had been adopted by over 100 hospitals.[53] Additional studies indicate ionization is superior to thermal eradication.[54]

Chlorine dioxide

potable water since 1945. Chlorine dioxide does not produce any carcinogenic byproducts like some other chlorine sources when used in the purification of drinking water that contains natural organic compounds such as humic and fulvic acids; trihalomethanes may be formed. Drinking water containing such molecules has been shown to increase the risk of cancer. ClO2 works differently from chlorine; its action is one of pure oxidation rather than halogenation, so these halogenated byproducts are not formed.[55]
Chlorine dioxide does not accumulate unlike copper. It has proven excellent control of Legionella in cold and hot water systems and its ability as a biocide is not affected by pH, or any water corrosion inhibitors such as silica or phosphate. However, it is 'quenched' by metal oxides, especially manganese and iron. Metal oxide concentrations above 0.5 mg/L may inhibit its activity.[citation needed] Monochloramine is an alternative. Like chlorine and chlorine dioxide, monochloramine is approved by the U.S. Environmental Protection Agency as a primary potable water disinfectant.[56] Environmental Protection Agency registration requires a biocide label which lists toxicity and other data required for all registered biocides. If the product is being sold as a biocide, then the manufacturer is legally required to supply a biocide label, and the purchaser is legally required to apply the biocide per the biocide label. When first applied to a system, chlorine dioxide can be added at disinfection levels of 2 ppm for 6 hours to clean up a system. This will not remove all biofilm, but will effectively remediate the system of Legionella.[citation needed]

Moist heat sterilization

Moist heat sterilization (superheating to 140 °F (60 °C) and flushing) is a nonchemical treatment that typically must be repeated every 3–5 weeks.[citation needed]

Ultraviolet

Ultraviolet light, in the range of 200 to 300 nm, can inactivate Legionella. According to a review by the US EPA, three-log (99.9%) inactivation can be achieved with a dose of less than 7 mJ/cm2.[56]

Biomonitoring

A Legionella-specific aptamer has been discovered[57] and in 2022 was developed into an assay for detecting to a limit of 104.3 cells/mL with no processing steps.[58]

European standards

Several European countries established the European Working Group for Legionella Infections[59] to share knowledge and experience about monitoring potential sources of Legionella. The working group has published guidelines about the actions to be taken to limit the number of colony-forming units (that is, live bacteria that are able to multiply) of Legionella per litre:

Legionella bacteria CFU/litre Action required (35 samples per facility are required, including 20 water and 10 swabs)
1000 or less System under control
more than 1000
up to 10,000		 Review program operation: The count should be confirmed by immediate resampling. If a similar count is found again, a review of the control measures and risk assessment should be carried out to identify any remedial actions.
more than 10,000 Implement corrective action: The system should immediately be resampled. It should then be "shot dosed" with an appropriate biocide, as a precaution. The risk assessment and control measures should be reviewed to identify remedial actions. (150+ CFU/mL in healthcare facilities or nursing homes require immediate action.)

Monitoring guidelines are stated in Approved Code of Practice L8 in the UK. These are not mandatory, but are widely regarded as so. An employer or property owner must follow an Approved Code of Practice, or achieve the same result. Failure to show monitoring records to at least this standard has resulted in several high-profile prosecutions, e.g. Nalco + Bulmers – neither could prove a sufficient scheme to be in place while investigating an outbreak, therefore both were fined about £300,000GBP. Important case law in this area is R v Trustees of the Science Museum 3 All ER 853, (1993) 1 WLR 1171[60]

Employers and those responsible for premises within the UK are required under Control of Substances Hazardous to Health to undertake an assessment of the risks arising from Legionella. This risk assessment may be very simple for low risk premises, however for larger or higher risk properties may include a narrative of the site, asset register, simplified schematic drawings, recommendations on compliance, and a proposed monitoring scheme.[61]

The L8 Approved Code of Practice recommends that the risk assessment should be reviewed at least every 2 years and whenever a reason exists to suspect it is no longer valid, such as water systems have been amended or modified, or if the use of the water system has changed, or if there is reason to suspect that Legionella control measures are no longer working.[citation needed]

Weaponization

Legionella could be used as a weapon, and indeed genetic modification of L. pneumophila has been shown where the mortality rate in infected animals can be increased to nearly 100%.

Obolensk until 1992, when he defected to the West. He later divulged much of the Soviet biological weapons program and settled in the United States.[citation needed
]

See also

References

  1. ^
    LPSN
    .
  2. S2CID 3331351
    .
  3. ^
    ISBN 978-9241562973
    .
  4. ^
    ISBN 0-9631172-1-1
    .
  5. ^ Kutty, Preeta K. (October 26, 2015). "What Everyone Needs to Know About Legionnaires Disease". Medscape.
  6. ^ Lawrence K. Altman (August 1, 2006). "In Philadelphia 30 Years Ago, an Eruption of Illness and Fear". New York Times.
  7. ^ ISO 11731-2:2004 Water quality – Detection and enumeration of Legionella – Part 2: Direct membrane filtration method for waters with low bacterial counts
  8. PMID 29980812
    .
  9. PMID 11136802
    .
  10. PMID 12384836
    .
  11. ^ "Legionnaires Disease Diagnosis, Treatment, and Prevention". CDC. 2021-03-25. Retrieved 2023-12-04.
  12. PMID 26270059
    .
  13. S2CID 233326323
    .
  14. S2CID 19944003
    .
  15. ^ "Legionella - Causes and Transmission - Legionnaires". CDC. 2018-04-30.
  16. ^ "Legionellosis (Legionnaires' Disease) Task Force Recommendations". Texas DSHS. Retrieved 2023-12-04.
  17. S2CID 13774784
    .
  18. PMID 29404281
    .
  19. ^ "Legionella (Legionnaires' Disease and Pontiac Fever)". CDC. June 1, 2017. Retrieved June 16, 2017.
  20. PMID 24462430
    .
  21. S2CID 32896608
    .
  22. PMID 22995431
    .
  23. PMID 20619131
    .
  24. S2CID 43919158
    .
  25. PMID 19580436
    .
  26. S2CID 207135938
    .
  27. ^ Infection Due to Legionella Species Other Than L. pneumophila Barry S. Fields*, Robert F. Benson, and Richard E. Besser https://academic.oup.com/cid/article/35/8/990/330989
  28. ^ American Society for Microbiology, Windshield washer fluid a source of Legionnaires: Found in most school buses
  29. ^ RR910 - Survival of Legionella pneumophila in metalworking fluids https://www.hse.gov.uk/research/rrhtm/rr910.htm
  30. PMID 12967487
    .
  31. ISBN 9781683672357
    .
  32. ^ "Controlling Legionella in Cooling Towers". CDC. 2021-02-03. Retrieved 2023-12-04.
  33. PMID 16323138
    .
  34. ^ Cooling Tower Notification
  35. PMID 12967487
    .
  36. ^
    PMID 30061526
    .
  37. ^
    PMID 34252427
    .
  38. ^
    S2CID 52115812
    .
  39. PMID 32594925
    .
  40. ^ "Legionellosis". WHO. 2022-09-06. Retrieved 2023-12-04.
  41. PMID 35863001
    .
  42. PMID 6469355
    .
  43. PMID 19368892
    .
  44. ISBN 978-0-309-49947-7
    .
  45. ^ "Safe Hot Water Temperature" (PDF). Chartered Institute of Plumbing and Heating Engineering. Archived from the original (PDF) on 2011-06-26.
  46. ^ "Employers Guide to the control of Legionella" (PDF). Health and Safety Executive. Archived from the original (PDF) on 11 June 2008. Retrieved 14 July 2019.
  47. PMID 31013887
    .
  48. ^ "HSG274 Part 1 Legionnaires' disease: Technical guidance" (PDF). legionellacontrol.com. Health and Safety Executive - UK. 2013. Retrieved 2023-02-06.
  49. ^ "Guidelines for Environmental Infection Control in Health-Care Facilities". CDC. 2003. Retrieved 2023-12-04.
  50. ^ Reiff, Fred (22 January 2010). "Legionella Control in Institutional Water Systems". Water Quality and Health Council. Retrieved 18 January 2017.
  51. ISBN 978-92-4-151369-2
    . Retrieved 2023-12-04.
  52. ^ Office of Water (2001). "Legionella: Drinking Water Health Advisory" (PDF). US Environmental Protection Agency. EPA-822-B-01-005. Retrieved 2023-12-04.
  53. PMID 12940575
    . (1) Demonstrated efficacy of Legionella eradication in vitro using laboratory assays, (2) anecdotal experiences in preventing legionnaires' disease in individual hospitals, (3) controlled studies in individual hospitals, and (4) validation in confirmatory reports from multiple hospitals during a prolonged time.
  54. ISBN 978-0-683-30740-5
    . Retrieved 2009-03-02.
  55. ^ . Chlorine dioxide residues of health concern in potable water are chlorates and chlorites. Regulatory authorities recommend routine monitoring of chlorate and chlorite residuals in potable water systems <World Health Organisation, Drinking Water Quality Guidelines>. Legionella Control With Chlorine Dioxide. Retrieved from https://feedwater.co.uk/legionella-control-services/
  56. ^ a b "Technologies for Legionella Control in Premise Plumbing Systems: Scientific Literature Review" (PDF). EPA. 2016. p. 60.
  57. PMID 32499557
    .
  58. S2CID 244584437
    . Retrieved 2 July 2022.
  59. ^ "European Working Group for Legionella Infections". Archived from the original on 2012-12-25. Retrieved 2006-07-07.
  60. ^ Whittaker, Howard. "The Law & Legionella (& HSE's Enforcement strategy)" (PDF).
  61. ^ "Legionnaires' disease - What you must do". Health and Safety Executive. Retrieved 2023-05-17.
  62. ^ Bhargava, Pushpa M. (December 1, 2008). "The Growing Planetary Threat From Biological Weapons and Terrorism". aina.org. Assyrian International News Agency. Retrieved June 16, 2017.
  63. PMID 15791517
    .
  64. ^ a b "Interview—Serguei Popov". November 1, 2000. Archived from the original on September 27, 2011. Retrieved June 16, 2017.

External links

Wikimedia Commons has media related to Legionella.
Wikispecies has information related to Legionella.
Retrieved from "https://en.wikipedia.org/w/index.php?title=Legionella&oldid=1219978713"