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The study on virulence of Vibrio parahaemolyticus was challenged by experimental study against mud crab (Scylla sp.). The healthy mud crabs were injected with V. parahaemolyticus at 101-1010 CFU (Colony Forming Unit) per milliliter (ml). After injected for 1 day, the cumulative mortality of crabs was 100% at 108-1010 CFU per ml of bacteria. After injected for 2 days, the cumulative mortality was 100% at 107 CFU per ml of V. parahaemolyticus. During 30 days, the cumulative mortality was 22.22% at 106 CFU per ml of bacteria. Furthermore, during 30 days, the cumulative mortality was 0.00% at 105-101 CFU per ml of V. parahaemolyticus. This study suggesting that the virulence of V. parahaemolyticus causes for rapid mass mortality of mud crab.
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