1 Division of Infectious Diseases, School of Medicine, University of California, Los Angeles, CA, USA. Electronic address: padamson@mednet.ucla.edu.
2 Department of Microbiology and Department of Microbiology and Parasitology, Hanoi Medical University, Hanoi, Viet Nam.
3 Centre for Clinical Research, The University of Queensland, Royal Brisbane and Women's Hospital, Brisbane, QLD, Australia.
4 Department of Microbiology and Department of Microbiology and Parasitology, Hanoi Medical University, Hanoi, Viet Nam. Electronic address: tranminhchau@hmu.edu.vn.