[1] Univ Hawaii, John A Burns Sch Med, Dept Pediat, Honolulu, HI 96826 USA
[2] Univ Hawaii, John A Burns Sch Med, Dept Trop Med & Microbiol, Honolulu, HI 96822 USA
[3] Univ Minnesota, Sch Med, Dept Pediat, WHO,Collaborating Ctr Reference & Res Streptococc, Minneapolis, MN 55455 USA