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Blastocystis incidence, spontaneous clearance, persistence and risk factors in a rural community in Thailand: A prospective cohort study

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Asian Pacific Journal of Tropical Medicine 2020年第3期13卷 123-130页

作者： Kawin Wongthamarin thanaporn trairattanapa Sirakit Kijanukul Thanakrit Kritsilpe Sarun Poobunjirdkul Warit Chuengdee Mathirut Mungthin Saovanee Leelayoova Tawee Naaglor Paanjit Taamasri PichaSuwannahitatorn Toon Ruang-Areerate Phunlerd Piyaraj Phramongkutklao College of Medicine Bangkok 10400Thailand Department of Parasitology Phramongkutklao College of MedicineBangkok 10400Thailand

Objective: To investigate the incidence, spontaneous clearance, persistence and risk factors of Blastocystis infection in a rural community in Thailand.Methods: In February 2016, a cohort study was conducted in a rural community of Thailand. Baseline information of intestinal parasitic infections and follow-up visits were conducted. Blastocystis infection was detected in stool samples examined with short-term in vitro cultivation using Jones’ medium supplemented with 10% horse serum. Participants were tested for Blastocystis infection at every study visit. Cox proportional hazard regression analysis was used to evaluate co-variates to determine the incidence of Blastocystis infection. Results: Of 733 enrolled participants, 57(7.78%) were positive and 676(92.22%) were negative for Blastocystis infection. All 676 participants were followed-up for Blastocystis infection between December 2016 and January 2018. In all, 52 of 482 cases(10.79%) comprised individual Blastocystis infection. The incidence density rates of Blastocystis infection, of spontaneous clearance of the disease and of persistent infection were 8.13, 63.14 and 38.70 per 1 000 person-months of follow-up, respectively. Our multivariate analysis revealed that opened defecation in fields or bushes(HR=4.8;95% CI=2.1-10.4, P<0.001), raising cows(HR=2.8;95% CI=1.1-7.1, P=0.032), not washing hands after animal contact(HR=2.1;95% CI=1.0-4.2, P=0.044) and presenting symptoms of nausea or vomiting(HR=2.3;95% CI=1.0-5.3, P=0.047) were predictive associated risks for the incidence of Blastocystis infection. Conclusions: Our study indicates that the best way to prevent Blastocystis infection can be by maintaining good personal hygiene, hand washing after animal contact and improving sanitary facilities.

关键词： Blastocystis Incidence Spontaneous clearance Persistence Risk factors Thailand

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