Etiology analysis of an acute gastroenteritis outbreak caused by co-infection with Vibrio parahaemolyticus and non-O1/O139 Vibrio cholerae oleh KANG Ying, QIAO Shengxin, YAN Aixia, ZHAO Wenxuan, CUI Yao, LI Shoufei, WANG Miao, WANG Yuanyuan, WANG Luotong, LI Ying, PANG Bo