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Applied and Environmental Microbiology, June 2001, p. 2840-2843, Vol. 67, No. 6
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.6.2840-2843.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Quantitative Shedding of Two Genotypes of Cryptosporidium parvum in California Ground Squirrels (Spermophilus beecheyi)

Edward R. Atwill,1,* Sergio Maldonado Camargo,1 Ralph Phillips,2 Laura Herrera Alonso,1 Kenneth W. Tate,3 Wayne A. Jensen,4 Joe Bennet,5 Scott Little,5 and Terrell P. Salmon6

Veterinary Medicine Teaching and Research Center, School of Veterinary Medicine, University of California-Davis, Tulare, California 932741; University of California Cooperative Extension, Bakersfield, California 933072; Department of Agronomy and Range Sciences3 and Department of Wildlife, Fish and Conservation Biology,6 University of California, Davis, California 95616; University of California Cooperative Extension, Santa Maria, California 934554; and United States Department of Agriculture, Wildlife Services Agency, Maricopa, California 932525

Received 15 May 2000/Accepted 16 March 2001

Sixteen percent of California ground squirrels (Spermophilus beecheyi) were found to be shedding an average of 53,875 Cryptosporidium parvum oocysts/g of feces. Male squirrels had a higher prevalence and higher intensity of shedding than did female squirrels. The majority of C. parvum isolates matched a bovine-murine genotype, with a few isolates resembling a porcine genotype. Higher intensities of shedding by males may enhance dissemination and genotypic mixing of this protozoa given males' proclivity to disperse to nonnatal colonies.

* Corresponding author. Mailing address: Veterinary Medicine Teaching and Research Center, 18830 Road 112, Tulare, CA 93274. Phone: (559) 688-1731. Fax: (559) 686-4231. E-mail: ratwill{at}vmtrc.ucdavis.edu.

Applied and Environmental Microbiology, June 2001, p. 2840-2843, Vol. 67, No. 6
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.6.2840-2843.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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