Molecular typing of Giardia duodenalis in humans in Queensland - first report of Assemblage E
Zahedi, A.ORCID: 0000-0002-0165-3797, Field, D. and Ryan, U.
ORCID: 0000-0003-2710-9324
(2017)
Molecular typing of Giardia duodenalis in humans in Queensland - first report of Assemblage E.
Parasitology, 144
(9).
pp. 1154-1161.
Available under License Creative Commons Attribution Non-commercial No Derivatives.
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Abstract
Little is known about the genetic diversity of the protozoan parasite, Giardia duodenalis, infecting humans in Queensland, Australia. The present study typed 88 microscopically Giardia-positive isolates using assemblage-specific primers at the triose phosphate isomerase (tpi) gene and sequenced a subset of isolates at the glutamate dehydrogenase (gdh) gene (n = 30) and tpi locus (n = 27). Using the tpi-assemblage specific primers, G. duodenalis assemblage A and assemblage B were detected in 50% (44/88) and 38·6% (34/88) of samples, respectively. Mixed infections with assemblages A and B were identified in 4·5% (4/88) and assemblage E was identified in 6·8% (6/88) of samples. Sequence analysis at the gdh and tpi loci also confirmed the presence of assemblage E in these isolates. Cyst numbers per gram of feces (g-1) were determined using quantitative polymerase chain reaction and of the isolates that were typed as assemblage E, cyst numbers ranged 13·8-68·3 × 106 cysts g-1. This is the first report of assemblage E in humans in Australia, indicating that in certain settings, this assemblage may be zoonotic
Item Type: | Journal Article |
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Murdoch Affiliation(s): | School of Veterinary and Life Sciences |
Publisher: | Cambridge University Press |
Copyright: | © Cambridge University Press 2017 |
URI: | http://researchrepository.murdoch.edu.au/id/eprint/36768 |
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