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Environmental ecology of Cryptosporidium and public health implications
1Department of Marine Sciences, University of South Florida, St. Petersburg 33701, USA. jrose@seas.marine.usf.edu
Abstract:
Cryptosporidium has become the most important contaminant found in drinking water and is associated with a high risk of waterborne disease particularly for the immunocompromised. There have been 12 documented waterborne outbreaks in North America since 1985; in two of these (Milwaukee and Las Vegas) mortality rates in the immunocompromised ranged from 52% to 68%. The immunofluorescence antibody assay (IFA) using epifluorescence microscopy has been used to examine the occurrence of Cryptosporidium in sewage (1 to 120 oocysts/liter), filtered secondary treated wastewater (0.01 to 0.13 oocysts/liter), surface waters (0.001 to 107 oocysts/liter), groundwater (0.004 to 0.922 oocysts/liter) and treated drinking water (0.001 to 0.72 oocysts/liter). New rules are being developed (Information Collection Rule and Enhanced Surface Water Treatment Rule) to obtain more occurrence data for drinking water systems for use with new risk assessment models. Public health officials should consider a communication program to physicians treating the immunocompromised, nursing homes, develop a plan to evaluate cases of cryptosporidiosis in the community, and contribute to the development of public policies that limit contamination of source waters, improve water treatment, and protect public health.
Insights
Cryptosporidium is a major drinking water contaminant causing severe illness, especially in immunocompromised individuals. Public health strategies must address source water protection, treatment, and physician communication to mitigate risks.
Area of Science:
- Environmental microbiology
- Public health
- Water quality analysis
Background:
- Cryptosporidium is a significant drinking water contaminant linked to severe waterborne diseases, particularly impacting immunocompromised populations.
- Past outbreaks, such as in Milwaukee and Las Vegas, demonstrated high mortality rates (52-68%) among immunocompromised individuals.
- Existing and upcoming regulations (Information Collection Rule, Enhanced Surface Water Treatment Rule) aim to gather more occurrence data for risk assessment.
Purpose of the Study:
- To highlight the public health risks associated with Cryptosporidium in drinking water.
- To present data on Cryptosporidium occurrence across various water sources.
- To recommend public health and policy actions for managing Cryptosporidium contamination.
Main Methods:
- Utilized immunofluorescence antibody assay (IFA) with epifluorescence microscopy.
- Quantified Cryptosporidium oocyst levels in sewage, treated wastewater, surface water, groundwater, and drinking water.
- Reviewed documented waterborne outbreaks and mortality data.
Main Results:
- Detected Cryptosporidium oocysts in all examined water types, including treated drinking water (0.001 to 0.72 oocysts/liter).
- Documented 12 North American waterborne outbreaks since 1985, with severe consequences for the immunocompromised.
- Identified significant Cryptosporidium presence in sewage and surface waters, indicating potential contamination pathways.
Conclusions:
- Cryptosporidium poses a substantial threat to public health, necessitating improved water safety measures.
- Effective management requires a multi-faceted approach including source water protection, advanced treatment technologies, and enhanced public health surveillance.
- Proactive communication with healthcare providers and the development of public policies are crucial for mitigating Cryptosporidium risks.