Identification and characterization of virulent Ah17 from infected in river Cauvery and in vitro evaluation of shrimp chitosan.

, an inhabitant in the aquatic ecosystem is considered as an important foodborne bacterial zoonotic pathogen in aquaculture. The present study aimed to identify virulent from naturally infected in river Cauvery and in vitro evaluation of shrimp chitosan. Rimler Shotts (RS) and blood agar medium identified the presence of pathogenic sp. from the infected . Ah17 was identified using 16S rRNA nucleotide sequence. Extracellular enzymes such as amylase, lipase, and protease were screened in Ah17. Antibiotic susceptibility tests showed Ah17 was highly resistant against -lactam, glycopeptide, macrolides, phosphonic, fucidin, and oxazolidinone classes of antibiotics. Virulent genes such as hemolysin ( and , heat-labile enterotoxin (), cytotonic heat-stable enterotoxin (), elastase (), and lipase () were identified. Growth and the viable cell population of virulent Ah17 were significantly reduced in a dose-dependent manner against shrimp chitosan (CHS) from (). Thus, the present study isolated virulent Ah17 from the environmental source and characterized in vitro with shrimp chitosan.