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Journal of Clinical Microbiology, March 2003, p. 967-975, Vol. 41, No. 3
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.3.967-975.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Blastocystis Isolates from a Pig and a Horse Are Closely Related to Blastocystis hominis

Umaporn Thathaisong,1 Jeerapun Worapong,2 Mathirut Mungthin,3 Peerapan Tan-Ariya,1 Kwanjai Viputtigul,4 Apichart Sudatis,4 Adisak Noonai,5 and Saovanee Leelayoova3*

Department of Microbiology, Faculty of Science,1 Center for Biotechnology, Mahidol University,2 Department of Parasitology,3 Department of Microbiology, Phramongkutklao College of Medicine,5 Division of Research, Armed Forces Research Institute of Medical Sciences, Bangkok 10400, Thailand4

Received 23 September 2002/ Returned for modification 12 November 2002/ Accepted 16 December 2002

Blastocystis has a widespread distribution in a variety of animals, which is a potential source of infection for humans. However, the contribution of zoonotic transmission remains unclear due to the absence of molecular proof of these organisms being identical to those found in humans. We report herein the similar subgroup of Blastocystis isolates from humans, pigs, and a horse using a restriction fragment length polymorphism (RFLP) analysis of partial small-subunit ribosomal DNA (ssu rDNA). Additionally, sequence and phylogenic analysis of partial ssu rDNA of Blastocystis from a human, a pig, and a horse sharing a common subgroup shows that Blastocystis isolates from a pig and a horse were monophyletic and closely related to B. hominis, with 92 to 94% identity. These results suggest the possibility of zoonotic potential of Blastocystis.

* Corresponding author. Mailing address: Department of Parasitology, Phramongkutklao College of Medicine, 315 Ratchawithee Rd., Ratchathewee, Bangkok 10400, Thailand. Phone and fax: 662-245-8331. E-mail: s_leelayoova{at}scientist.com.

Journal of Clinical Microbiology, March 2003, p. 967-975, Vol. 41, No. 3
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.3.967-975.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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