Infection of Metacercariae in Rice-Field Crab from Nonthaburi Province, Central Thailand
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Abstract
A survey on metacercariae infection was conducted with rice field crabs (Sayamia bangkokensis) from Nonthaburi province, Central Thailand. Crab samples were collected from January to April 2018. The metacercarial cysts from genus Paragonimus were detected from 160 crabs out of 205. Prevalence and mean intensity were 78% and 4.3 ± 3.3 parasites/crab, respectively. Most of the parasites were found in hepatopancreas. The infection was higher in males than females with the prevalence of 81.8% and 73.7%, and mean intensity of 4.7 ± 3.7 and 3.8 ± 2.7 parasites/crab, respectively. However, the prevalence and mean intensity were not significantly different (p>0.05) between genders. Moreover, the infection was found higher in large crab (4.01-5.00 cm) than small crab (2.00-3.00 cm). The prevalence rates were 33.3%, 56.0% and 82.8% and mean intensity values were 3.0 ± 0.0, 4.3 ± 2.5 and 4.3 ± 3.4 parasites/crab in small, medium, and large size, respectively. Consequently, it is recommended that the crab should be cooked before they are consumed to prevent infection.
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