1. CAS Key Laboratory of Pathogen Microbiology and Immunology, Institute of Microbiology, Chinese Academy of Sciences, Beijing, China
2. Department of Medical Microbiology, Faculty of Medical Laboratory Sciences, University of Khartoum, Khartoum, Sudan
3. Biomedical Research Institute, Darfur University College, Nyala, Sudan
4. Department of Epidemiology and Health Statistics, School of Public Health, Southeast University, Nanjing, China