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The article focuses on a study which examined correlations between shrimp pathogenicity in Vibrio (V.) harveyi isolated from Thailand, hemolysis, hemolysin genes and vcrD, a gene involved in the type III secretion system (TTSS) of V. harveyi. TTSS, described as a bacterial system that transfers effector virulence proteins across the membrane of the bacterial pathogen into the cytoplasm of the host cell, can be found in many Gram-negative bacteria. Through random amplified polymorphic DNA (RAPD) analysis, researchers found a high degree of genetic diversity in all the V. harveyi isolates.