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Ctr Dis Control & Prevent, Influenza Branch, Natl Ctr Infect Dis, Atlanta, GA USA. Ctr Dis Control & Prevent, Div Bacterial & Mycot Dis, Natl Ctr Infect Dis, Atlanta, GA USA. Ctr Dis Control & Prevent, Off Director, Div Viral & Rickettsial Dis, Natl Ctr Infect Dis, Atlanta, GA USA. WHO, Hanoi, Vietnam. Queen Mary Hosp, Govt Virus Unit, Hong Kong, Hong Kong, Peoples R China. Int Emerging Infect Dis Program, Bangkok, Thailand. Univ Calif San Francisco, San Francisco, CA 94143 USA. Singapore Gen Hosp, Dept Pathol, Singapore, Singapore. Ctr Dis Control, Dept Hlth, Taipei, Taiwan.