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Giardia duodenalis cysts of genotype a recovered from clams in the Chesapeake Bay subestuary, Rhode River

Graczyk, T.K., Thompson, R.C.A., Fayer, R., Adams, P.J., Morgan, U.M. and Lewis, E.J. (1999) Giardia duodenalis cysts of genotype a recovered from clams in the Chesapeake Bay subestuary, Rhode River. American Journal of Tropical Medicine and Hygiene, 61 (4). pp. 526-529.

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    Abstract

    Filter-feeding molluscan shellfish can concentrate zoonotic and anthroponotic waterborne pathogens. Cysts of Giardia sp. were detected by immunofluorescent antibodies in tissues of the clams Macoma balthica and M. mitchelli from Rhode River, a Chesapeake Bay (Maryland) subestuary. Molecular tests identified the cysts as Giardia duodenalis Genotype A, the most common genotype recovered from humans. Macoma clams are burrowers in mud or sandy- mud substrata and preferentially feed on the surface sediment layer. Waterborne Giardia cysts settle rapidly to the bottom in slow-moving waters and contaminate the sediment. Macoma clams do not have economic value, but can serve as biologic indicators of sediment contamination with Giardia sp. cysts of public health importance. These clams can be used for sanitary assessment of water quality.

    Publication Type: Journal Article
    Murdoch Affiliation: School of Veterinary and Biomedical Sciences
    Publisher: American Society of Tropical Medicine and Hygiene
    URI: http://researchrepository.murdoch.edu.au/id/eprint/3193
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