Funding for this research was provided by:
National Institute of Allergy and Infectious Diseases (U19 AI089672)
Fogarty International Center (D43 TW006571)
Received: 28 October 2019
Accepted: 3 February 2020
First Online: 12 February 2020
Ethics approval and consent to participate
: Ethical approvals were obtained from the institutional review boards of China Medical University, Kunming Medical University, Mahidol University and Pennsylvania State University. Written consent was obtained from all donors of the blood samples or their guardians.
: Not applicable.
: The authors declare that they have no competing interests.