[1] Univ Calif San Francisco, Dept Biochem & Biophys, San Francisco, CA 94107 USA
[2] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94107 USA
[3] Univ Calif San Francisco, Dept Lab Med, San Francisco, CA 94107 USA
[4] Univ Calif San Francisco, Dept Med, Div Infect Dis, San Francisco, CA 94107 USA
[5] Univ Calif San Francisco, Abbott Viral Diagnost & Discovery Ctr, San Francisco, CA 94107 USA
[6] Univ Wisconsin, Dept Med, Div Allergy & Immunol, Madison, WI 53706 USA
[7] Univ Wisconsin, Dept Pathol & Lab Med, Madison, WI 53706 USA
[8] Univ Wisconsin, Dept Pediat, Madison, WI 53706 USA
[9] NCI, Expt Transplantat & Immunol Branch, Ctr Canc Res, NIH, Bethesda, MD 20892 USA
[10] Duke Univ, Dept Pediat, Div Allergy & Immunol, Durham, NC 27706 USA
[11] Duke Univ, Dept Immunol, Div Allergy & Immunol, Durham, NC USA
[12] Ctr Dis Control & Prevent, Atlanta, GA USA