[1] SUNY Buffalo, Dept Microbiol & Immunol, Buffalo, NY 14260 USA
[2] SUNY Buffalo, Witebsky Ctr Microbial Pathogenesis & Immunol, Buffalo, NY 14260 USA
[3] Univ Toronto, Dept Mol Genet, Toronto, ON, Canada
[4] Vet Affairs Med Ctr, Ctr Immunochem, San Francisco, CA 94121 USA
[5] Univ Calif San Francisco, Dept Lab Med, San Francisco, CA 94143 USA