Witchakorn Trisukon, 5th year medical student, is currently studying in Phramongkutklao college of medicine, Thailand and will graduate in 2017. He is interesting psychiatry and eager to conduct a research about depression in future. By co-operate with his colleague and advice from supervisors, this abstract is his 1st research paper and will be published in near future.


Blastocystis sp., an intestinal protozoan, is commonly identified in humans and animals worldwide, especially in developing countries. The evidence of Blastocystis sp. as a pathogen has been accumulated in recent years. Blastocystis sp. is transmitted by feco-oral route. In Thailand, the prevalences of Blastocystis infection were different in each community and population. This study aimed to identify prevalence of Blastocystis infection among primary school students in a rural community and identify association factors of the infection. A cross-sectional study was conducted. Stool examinations including wet preparation, and culture using Jones’ medium were performed to detect Blastocystis infection. Kato, formalin-ethyl acetate concentration and agar plate techniques also were used to detect other intestinal parasitic infections. Standardized questionnaires were used to assess risk behaviors. Of 501 stool specimens, there are 64 specimens (12.8%) positive for Blastocystis sp. Other intestinal parasitic infections were founded including Giardia duodenalis (1.4%), Entamoeba coli (1.0%), Opisthorchis viverrini (0.8%), Enterobius vermicularis (0.6%), Strongyloides stercoralis (0.4%). Studying in some particular schools was associated with acquiring the infection. Intestinal protozoa infections are predominant in this population. According to interview with school director, source of drinking are suspected environmental factor causing Blastocystis sp. infection. Quality of water should be further investigated.

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