1. Department of Microbiology, Harbin Medical University, 150081 Harbin, China
2. Department of Microbiology, Beihua University, 132013 Jilin, China
3. Blood Centre,150056 Harbin, China
4. Department of Medical Laboratory Science, College of Health Science, Arsi University, POBX 193 Asella, Ethiopia
5. Heilongjiang Province Key Laboratory of Immunity & Infection, Pathogenic Biology, 150081 Harbin, China