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Presence of human Giardia in domestic, farm and wild animals, and environmental samples suggests a zoonotic potential for giardiasis.

Abstract

Giardia lamblia which parasitize humans belong to either of two genotypes, A or B, based on specific signature sequences in the 5' end of the small subunit (16S) ribosomal RNA (rRNA) gene. These two genotypes also were found in cysts from fecal samples of animal origin such as dogs, cats, some farm animals and wild animals. In addition, trophozoites recovered from cysts obtained from environmental samples belonged to these two genotypes as well, suggesting that the G. lamblia genotypes A and B are widespread and possibly zoonotic. Trophozoites were recovered from rats and these isolates might belong to another genotype of G. lamblia. Deer mice and one dog appeared to be parasitized by genotypes of Giardia with close affinity to G. microti. This species, therefore, also consists of a genotype complex.

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  • Publisher Full Text
  • Authors

    van Keulen H, Macechko PT, Wade S, Schaaf S, Wallis PM, Erlandsen SL

    Source

    Veterinary parasitology 108:2 2002 Sep 10 pg 97-107

    MeSH

    Animals
    Animals, Wild
    Base Sequence
    Cats
    Cattle
    DNA, Protozoan
    Dogs
    Feces
    Giardia lamblia
    Giardiasis
    Humans
    Molecular Sequence Data
    Phylogeny
    Polymerase Chain Reaction
    Polymorphism, Restriction Fragment Length
    RNA, Ribosomal, 16S
    Sequence Homology, Nucleic Acid
    Sheep
    Swine
    Water
    Zoonoses

    Pub Type(s)

    Journal Article
    Research Support, Non-U.S. Gov't

    Language

    eng

    PubMed ID

    12208038