Effects of Physicochemical Factors on Loss of Infectivity of Opisthorchis viverrini Cercariae

This study aims to develop an alternative field-based approach interrupt the life cycle of O. viverrini. The effects temperature, salinity, acidity, ultraviolet A, B, C radiation, and combinations these physicochemical factors on loss infectivity Opisthorchis viverrini cercariae were analyzed determine values required for 50 95 % lethal concentrations (LC50 LC95) period infection success (LI50 LI95). Newly shed used. LC50 LC95 acidity 33.19 37.70 ºC, 7.29 8.40 ppt, 4.62 4.80 M H2CO3, respectively. LI50 LI95 by exposure UVA, UVB, UVC 19.54 20.11 h, 5.03 5.12 3.37 6.02 min, Combinations in presence proved damaging most rapidly. shortest time 1.09 2.83 min. Cercariae deemed have lost ability infect cyprinid fish when they had their tails, even though still capable some movement. In nature, factors, affect fish.