National Institutes of HealthUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) - USA [R01 AI036959]; China Scholarship Council of Chinese Ministry of Education [201506775010]; NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASESUnited States Department of Health & Human ServicesNational Institutes of Health (NIH) - USANIH National Institute of Allergy & Infectious Diseases (NIAID) [R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959, R01AI036959] Funding Source: NIH RePORTER