Abstract
Giardia has been found in numerous species of mammalian wildlife but very little information is available on the species and strains/genotypes that occur naturally in mammals in the wild. Recently, a novel genotype of Giardia was described in Western Australia, in the Southern brown bandicoot, or quenda ( Isoodon obesulus). In order to determine the host range, distribution and prevalence of this novel ‘quenda’ ‘genotype of Giardia, a comprehensive survey of this marsupial and cohabiting mammalian species was undertaken throughout the mainland and some off-shore islands of Western Australia, including urban areas. The overall prevalence of Giardia in 351 wildlife samples was low, with only 4.8% (17) samples testing positive. Amongst the 51 quenda samples, 11.8% (6) were positive for the ‘quenda’ genotype, 5.9% (3) for assemblage C/D and 2% (1) for assemblages A and E. This study has demonstrated that Giardia is a remarkably rare parasite in native wildlife in Western Australia, raising questions about the ecology of Giardia infections in wildlife.
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