1. Department of Microbiology, Yongchuan Hospital of Chongqing Medical University, Chongqing, China.
2. Department of Microbiology, The First People's Hospital of Jingzhou City, Jingzhou, China.
3. Department of Microbiology, First Affiliated Hospital of Jiamusi University, Jiamusi, China.
4. Center for Disease Control and Prevention, Jiamusi, China.