[1] Univ Sydney, Dept Pathol, Sydney, NSW 2006, Australia
[2] Queensland Inst Med Res, Brisbane, Qld 4006, Australia
[3] Univ Alabama Birmingham, Dept Microbiol, Birmingham, AL 35294 USA
[4] La Jolla Infect Dis Inst, San Diego, CA USA
[5] Walter & Eliza Hall Inst Med Res, Melbourne, Vic 3050, Australia
[6] Hebrew Univ Jerusalem, Dept Microbiol & Mol Genet, Jerusalem, Israel