[1] Univ Iowa, Coll Publ Hlth, Ctr Emerging Infect Dis, Iowa City, IA 52242 USA
[2] US Mil HIV Res Program, Rockville, MD USA
[3] USAF, Inst Operat Hlth, Brooks AFB, TX USA
[4] USN, Med Res Ctr Detachment, Lima, Peru
[5] Univ Quebec, CHU Quebec, Quebec City, PQ, Canada