[1] Del Valle Univ Guatemala, Guatemala City 01015, Guatemala
[2] Ctr Dis Control & Prevent Collaborat, Guatemala City, Guatemala
[3] Ctr Dis Control & Prevent, Natl Ctr HIV STD & TB Prevent, Atlanta, GA USA
[4] Natl Inst Communicable Dis NHLS, STI Reference Ctr, Sandringham, England
[5] Natl Inst Communicable Dis NHLS, STI Reference Ctr, Sandringham, England
[6] Natl Inst Communicable Dis NHLS, Specialized Mol Diagnost Unit, Sandringham, England
[7] Univ Witwatersrand, Dept Internal Med, Johannesburg, South Africa