Briefly, the isolate was grown on NA plates (Sinopharm Chemical Reagent Co., Ltd.) at 28 ± 1 C for 24 h, and a bacterial suspension was then used to inoculate the API ID32GN strip (Bio-Merieux, SA) according to the manufacturer’s instructions. The strip was incubated at 28 ± 1 C and observed after 48 h to check against the API identification index and database. The type strain V. cholerae ATCC 14035 was used as the control.