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Microbiology 150 (2004), 1147-1151; DOI  10.1099/mic.0.26899-0
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Microbiology 150 (2004), 1147-1151; DOI  10.1099/mic.0.26899-0
© 2004 Society for General Microbiology

PCR-based identification of zoonotic isolates of Blastocystis from mammals and birds

Hisao Yoshikawa1, Niichiro Abe2 and Zhiliang Wu3

1 Department of Biological Science, Faculty of Science, Nara Women's University, Kitauoya-Nishimachi, Nara 630-8506, Japan
2 Department of Microbiology, Osaka City Institute of Public Health and Environmental Sciences, Tennoji-ku, Osaka 543-0026, Japan
3 Department of Parasitology, Gifu University School of Medicine, Tsukasa-40, Gifu 500-8705, Japan

Correspondence
Hisao Yoshikawa
h.yoshikawa{at}cc.nara-wu.ac.jp

The genotype of Blastocystis isolated from humans and animals is highly polymorphic. Therefore, it is important to compare the genotypes of Blastocystis isolates from humans and animals to determine the zoonotic potential of animal isolates. PCR-based genotype classification using known sequence-tagged site (STS) primers allows identification of zoonotic isolates of animal origin. To this end, 51 isolates from monkeys, cattle, pigs, chickens, quails and pheasants were subjected to genotype analysis using seven kinds of STS primers. Out of the 51 isolates, 39 were identified as one of the known genotypes, four showed mixed genotypes, and eight were unknown genotypes as these were negative for all STS primers. When these results were combined with previous studies on 41 isolates from animals and compared with the diversity of genotypes of 102 human Blastocystis hominis isolates, 67·4 % (62/92) of isolates from mammals and birds were identical to human B. hominis genotypes. Since the unknown genotype of human origin had been placed into an additional clade in the small-subunit rRNA gene phylogeny, further molecular study on the eight isolates of unknown genotype from the present study will facilitate our understanding of their zoonotic potential.

Abbreviations: STS, sequence-tagged site




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