Opisthorchis viverrini is a zoonotic liver fluke that causes opisthorchiasis among humans in endemic areas, such as northeastern Thailand. The objective of this study was to determine the prevalence and risk factors for O. viverrini infection among cats and dogs in six districts surrounding Ubolratana Dam. Fecal samples of 1,018 dogs and 249 cats were collected between 2008 and 2013 to examine for O. viverrini infection using a modified formalin-ether concentration technique. The prevalence of O. viverrini infection among cats (77 of 249, 30.92%) was higher than dogs (2 of 1,018, 0.20%). Age and the eating habits of cats were associated with O. viverrini infection. Cats aged >3 years were more likely than those aged <1 year [Odds ratio (OR)=2.96; 95% confidence interval (95% CI): 1.01- 8.35; p = 0.044] of being infected. Cats that consumed raw fish were significantly more likely to be infected than those that consumed other foods (OR=1.82, 95% CI: 1.05-3.16; p = 0.032). Cats had a higher prevalence of O. viverrini infection than dogs and may play an important role in the transmission and maintenance of this disease in the study area.
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