1. Department of Microbiology, Yamanashi Medical University, Yamanashi, Japan; Virology Laboratory, University Teaching Hospital, Lusaka, Zambia
2. Department of Microbiology, Yamanashi Medical University, Yamanashi, Japan
3. Virology Laboratory, University Teaching Hospital, Lusaka, Zambia
4. Central Board of Health, Lusaka, Zambia
5. AIDS Research Center, NIID, Japan
6. Department of Microbiology, Tokyo Medical Dental University, Tokyo, Japan