Sample collection and in-country laboratory analysis.

aExcludes participants who were not contacted, declined participation, or did not meet enrollment criteria. bSamples were not obtained for 2,744 eligible participants (2,310 no consent, 439 blood draw failure, 19 excluded for other reasons). The HIV status of study participants was initially characterized based on the results of the two HIV rapid tests performed in-country (see Methods): HIV POS: two reactive HIV rapid tests. HIV DISC: one reactive and one non-reactive HIV rapid test. HIV NEG: two non-reactive HIV rapid tests. cAn initial estimate of HIV prevalence was based on in-country testing (calculated as # HIV POS samples/total # samples×100).