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Applied and Environmental Microbiology
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Environmental Microbiology

Molecular Characterization of Giardia Isolates from Calves and Humans in a Region in Which Dairy Farming Has Recently Intensified

Cynthia L. Winkworth, James J. Learmonth, Christoph D. Matthaei, Colin R. Townsend
Cynthia L. Winkworth
1Department of Zoology, University of Otago, Dunedin, New Zealand
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  • For correspondence: cynthia.winkworth@zoology.otago.ac.nz
James J. Learmonth
2Protozoa Research Unit, Institute of Veterinary, Animal and Biomedical Sciences, Massey University, Palmerston North, New Zealand
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Christoph D. Matthaei
1Department of Zoology, University of Otago, Dunedin, New Zealand
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Colin R. Townsend
1Department of Zoology, University of Otago, Dunedin, New Zealand
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DOI: 10.1128/AEM.00232-08
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ABSTRACT

Giardiasis is a notifiable disease of high prevalence in New Zealand, but there is limited knowledge about the sources of Giardia duodenalis genotypes that can potentially cause human infections. Dairy calves are one environmental source of Giardia isolates, but it is unknown whether they harbor genotypes that are potentially capable of causing infections in humans. To address these questions, 40 Giardia isolates from calves and 30 from humans, living in the same region and collected over a similar period, were genotyped using the β-giardin gene. The G. duodenalis genetic assemblages A and B were identified from both calves and humans, and genotype comparisons revealed a substantial overlap of identical genotypes from the two hosts for both assemblages. Significantly, no assemblage E (the genotype commonly found in cattle elsewhere in the world) has been detected in New Zealand livestock to date. Given recent and rapid land use conversions to dairy farming in many South Island regions of New Zealand, an increasingly large concentration of domestic cattle harboring genotypes potentially capable of causing infections in humans is particularly concerning.

  • Copyright © 2008 American Society for Microbiology
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Molecular Characterization of Giardia Isolates from Calves and Humans in a Region in Which Dairy Farming Has Recently Intensified
Cynthia L. Winkworth, James J. Learmonth, Christoph D. Matthaei, Colin R. Townsend
Applied and Environmental Microbiology Aug 2008, 74 (16) 5100-5105; DOI: 10.1128/AEM.00232-08

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Molecular Characterization of Giardia Isolates from Calves and Humans in a Region in Which Dairy Farming Has Recently Intensified
Cynthia L. Winkworth, James J. Learmonth, Christoph D. Matthaei, Colin R. Townsend
Applied and Environmental Microbiology Aug 2008, 74 (16) 5100-5105; DOI: 10.1128/AEM.00232-08
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KEYWORDS

Cattle Diseases
Cytoskeletal Proteins
Giardia
Giardiasis
Protozoan Proteins

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