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Related Experiment Video

Updated: Jul 1, 2026

A Modified EPA Method 1623 that Uses Tangential Flow Hollow-fiber Ultrafiltration and Heat Dissociation Steps to Detect Waterborne Cryptosporidium and Giardia spp.
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Cryptosporidium source tracking in the Potomac River watershed.

Wenli Yang1, Plato Chen, Eric N Villegas

  • 1National Center for Infectious Disease, Centers for Disease Control and Prevention, Atlanta, GA 30341-3717, USA.

Applied and Environmental Microbiology
|September 9, 2008
PubMed
Summary

Cryptosporidium oocysts were analyzed in the Potomac River watershed using PCR genotyping. The study found C. andersoni, likely from cattle, was common, while human pathogens were absent, suggesting low human health risk.

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Published on: June 25, 2020

Area of Science:

  • Environmental microbiology
  • Water quality analysis
  • Parasitology

Background:

  • Cryptosporidium is a significant waterborne protozoan parasite.
  • Understanding Cryptosporidium sources in watersheds is crucial for public health.
  • Land use impacts pathogen contamination in water sources.

Purpose of the Study:

  • To genotype Cryptosporidium in the Potomac River watershed.
  • To identify sources of Cryptosporidium oocysts in drinking water intakes.
  • To assess potential human health risks associated with detected Cryptosporidium species.

Main Methods:

  • Analysis of 64 base flow and 28 storm flow water samples from five sites.
  • Utilized Polymerase Chain Reaction (PCR)-based genotyping.
  • Compared results with Environmental Protection Agency (EPA) Method 1623 (microscopy).

Main Results:

  • Cryptosporidium detected in 27 base flow and 23 storm flow samples.
  • C. andersoni was the most frequent species (41 samples), associated with agricultural sites.
  • Human pathogens C. hominis and C. parvum were not detected; only 9% of samples were positive by microscopy.

Conclusions:

  • The predominant Cryptosporidium species in the Potomac River watershed were C. andersoni, likely originating from cattle.
  • Absence of human-pathogenic Cryptosporidium species suggests a low risk to human health from these source waters.
  • Genotyping provides a more detailed understanding of Cryptosporidium contamination than traditional microscopy.