Presence and distribution of Giardia cysts in New Zealand waters

Tim J. Brown Massey University/New Zealand Health Department Giardia Unit, Department of Microbiology and Genetics School of Biological Sciences, Massey University, Private Bag, Palmerston North, New Zealand

Joanna C. Hastie Massey University/New Zealand Health Department Giardia Unit, Department of Microbiology and Genetics School of Biological Sciences, Massey University, Private Bag, Palmerston North, New Zealand

Philip J. Kelly Massey University/New Zealand Health Department Giardia Unit, Department of Microbiology and Genetics School of Biological Sciences, Massey University, Private Bag, Palmerston North, New Zealand

Robert van Duivenboden Massey University/New Zealand Health Department Giardia Unit, Department of Microbiology and Genetics School of Biological Sciences, Massey University, Private Bag, Palmerston North, New Zealand

Jeffrey Ainge Resource Use and Recreation Division, Department of Conservation, P. O. Box 10–420, Wellington, New Zealand

Neville Jones Resource Use and Recreation Division, Department of Conservation, P. O. Box 10–420, Wellington, New Zealand

Natalie K. Walker Public Health Laboratory, New Zealand Communicable Disease Centre, P. O. Box 50–348, Porirua, New Zealand

Desmond G. Till Public Health Laboratory, New Zealand Communicable Disease Centre, P. O. Box 50–348, Porirua, New Zealand

Helen Sillars Microbiology Laboratory, Wellington Regional Council, P. O. Box 11–646, Wellington, New Zealand

Fiona Lemmon Microbiology Laboratory, Wellington Regional Council, P. O. Box 11–646, Wellington, New Zealand

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Abstract

Giardia intestinalis cyst monitoring programmes from New Zealand waters were carried out between 30 March 1990 and 1 August 1991. Giardia cysts were found in 135 of 412 samples (33%). The corresponding cyst concentrations ranged from 0.0 to 45.06 cysts per 100 1. Cyst recovery efficiency using seeded samples ranged from 26 to 75% using a membrane‐filtration/immuno‐fluorescence assay procedure. Test sensitivities ranged from < 0.02 to < 5.0 cysts per 100 1. No definite distribution pattern resulted.

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Presence and distribution of Giardia cysts in New Zealand waters

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