作者单位:Emory Univ, Div Infect Dis, Atlanta, GA USA[1]Univ Calif San Francisco, Dept Med, San Francisco, CA 94143 USA[2]Univ Washington, Div Allergy & Infect Dis, Seattle, WA 98195 USA[3]Univ Calif San Francisco, Div Infect Dis, San Francisco, CA USA[4]