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Applied and Environmental Microbiology, August 2005, p. 4446-4454, Vol. 71, No. 8
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.8.4446-4454.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Distribution of Cryptosporidium Genotypes in Storm Event Water Samples from Three Watersheds in New York

Jianlin Jiang,1 Kerri A. Alderisio,2 and Lihua Xiao1*

Division of Parasitic Disease, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia 30341,1 New York City Department of Environmental Protection, Valhalla, New York 105952

Received 21 October 2004/ Accepted 25 February 2005

To assess the source and public health significance of Cryptosporidium oocyst contamination in storm runoff, a PCR-restriction fragment length polymorphism technique based on the small-subunit rRNA gene was used in the analysis of 94 storm water samples collected from the Malcolm Brook and N5 stream basins in New York over a 3-year period. The distribution of Cryptosporidium in this study was compared with the data obtained from 27 storm water samples from the Ashokan Brook in a previous study. These three watersheds represented different levels of human activity. Among the total of 121 samples analyzed from the three watersheds, 107 were PCR positive, 101 of which (94.4%) were linked to animal sources. In addition, C. hominis (W14) was detected in six samples collected from the Malcolm Brook over a 2-week period. Altogether, 22 Cryptosporidium species or genotypes were found in storm water samples from these three watersheds, only 11 of which could be attributed to known species/groups of animals. Several Cryptosporidium spp. were commonly found in these three watersheds, including the W1 genotype from an unknown animal source, the W4 genotype from deer, and the W7 genotype from muskrats. Some genotypes were found only in a particular watershed. Aliquots of 113 samples were also analyzed by the Environmental Protection Agency (EPA) Method 1623; 63 samples (55.7%) were positive for Cryptosporidium by microscopy, and 39 (78%) of the 50 microscopy-negative samples were positive by PCR. Results of this study demonstrate that molecular techniques can complement traditional detection methods by providing information on the source of contamination and the human-infective potential of Cryptosporidium oocysts found in water.

* Corresponding author. Mailing address: Division of Parasitic Disease, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Building 22, Mail Stop F-12, 4770 Buford Highway, Atlanta, GA 30341-3717. Phone: (770) 488-4840. Fax: (770) 488-4454. E-mail: lxiao{at}cdc.gov.

Applied and Environmental Microbiology, August 2005, p. 4446-4454, Vol. 71, No. 8
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.8.4446-4454.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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