title: Cryptosporidium source tracking in the Potomac River watershed.
abstract: To better characterize Cryptosporidium in the Potomac River watershed, a PCR-based genotyping tool was used to analyze 64 base flow and 28 storm flow samples from five sites in the watershed. These sites included two water treatment plant intakes, as well as three upstream sites, each associated with a different type of land use. The uses, including urban wastewater, agricultural (cattle) wastewater, and wildlife, posed different risks in terms of the potential contribution of Cryptosporidium oocysts to the source water. Cryptosporidium was detected in 27 base flow water samples and 23 storm flow water samples. The most frequently detected species was C. andersoni (detected in 41 samples), while 14 other species or genotypes, almost all wildlife associated, were occasionally detected. The two common human-pathogenic species, C. hominis and C. parvum, were not detected. Although C. andersoni was common at all four sites influenced by agriculture, it was largely absent at the urban wastewater site. There were very few positive samples as determined by Environmental Protection Agency method 1623 at any site; only 8 of 90 samples analyzed (9%) were positive for Cryptosporidium as determined by microscopy. The genotyping results suggest that many of the Cryptosporidium oocysts in the water treatment plant source waters were from old calves and adult cattle and might not pose a significant risk to human health.
authors.affiliation: National Center for Infectious Disease, Centers for Disease Control and Prevention, Atlanta, GA 30341-3717, USA.
authors.forename: Wenli
authors.initials: W
authors.lastname: Yang
authors.forename: Plato
authors.initials: P
authors.lastname: Chen
authors.forename: Eric N
authors.initials: EN
authors.lastname: Villegas
authors.forename: Ronald B
authors.initials: RB
authors.lastname: Landy
authors.forename: Charles
authors.initials: C
authors.lastname: Kanetsky
authors.forename: Vitaliano
authors.initials: V
authors.lastname: Cama
authors.forename: Theresa
authors.initials: T
authors.lastname: Dearen
authors.forename: Cherie L
authors.initials: CL
authors.lastname: Schultz
authors.forename: Kenneth G
authors.initials: KG
authors.lastname: Orndorff
authors.forename: Gregory J
authors.initials: GJ
authors.lastname: Prelewicz
authors.forename: Miranda H
authors.initials: MH
authors.lastname: Brown
authors.forename: Kim Roy
authors.initials: KR
authors.lastname: Young
authors.forename: Lihua
authors.initials: L
authors.lastname: Xiao
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology*; D003457:Cryptosporidiosis / Q000662:veterinary*; D003458:Cryptosporidium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification*; D016054:DNA, Protozoan / Q000737:chemistry / Q000235:genetics; D005838:Genotype; D006801:Humans; D008396:Maryland; D017720:Molecular Epidemiology; D008969:Molecular Sequence Data; D016133:Polymerase Chain Reaction; D045483:Rivers / Q000469:parasitology*; D017422:Sequence Analysis, DNA; D014768:Virginia
chemical_list: D016054:DNA, Protozoan
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