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Drinking Water: A Possible Source of Blastocystis spp. Subtype 1 Infection in Schoolchildren of a Rural Community in Central Thailand

In January 2005, a survey of intestinal parasitic infections was performed in a primary school, central Thailand. Of 675 stool samples, Blastocystis was identified with a prevalence of 18.9%. Genetic characterization of Blastocystis showed subtype 1 (77.9%) and subtype 2 (22.1%). Study of the water supply in this school was performed to find the possible sources of Blastocystis. Blastocystis from one water sample was identified as subtype 1, which had a nucleotide sequence of small subunit (SSU) ribosomal RNA (rRNA) gene that was 100% identical to that of Blastocystis infected in schoolchildren. Our information supports the evidence of water-borne transmission in this population.

Received December 10, 2007. Accepted for publication May 13, 2008.

Financial support: This study was financially supported by the Office of Research Development, Ministry of Defense, Thailand, and the Thailand Research Fund (BRG 4880003).

^* Address correspondence to Saovanee Leelayoova, Department of Parasitology, Phramongkutklao College of Medicine, 315 Ratchawithi Road, Ratchathewi, Bangkok 10400, Thailand. E-mail: s_leelayoova{at}scientist.com

Authors’ addresses: Saovanee Leelayoova, Suradej Siripattanapipong, Tawee Naaglor, Paanjit Taamasri, Phunlerd Piyaraj, and Mathirut Mungthin, Department of Parasitology, Phramongkutklao College of Medicine, 315 Ratchawithi Rd., Ratchathewi, Bangkok 10400, Thailand. Umaporn Thathaisong, Department of Microbiology, Faculty of Science, Burapha University, Chonburi Province 20131, Thailand.