[1] Univ Melbourne, Dept Microbiol & Immunol, Parkville, Vic 3052, Australia
[2] St Vincents Hosp, Ctr Immunol, Sydney, NSW 2010, Australia
[3] Univ New S Wales, Natl Ctr HIV Epidemiol & Clin Res, Sydney, NSW, Australia
[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA
[5] Royal Melbourne Hosp, Victorian Infect Dis Serv, Parkville, Vic 3050, Australia