Fig. 2

Classification of infants into high or low risk of HIV vertical transmission according to the WHO algorithm and WHO modified algorithm. The additional question was added at the last step for mothers on ART ≥4 weeks before delivery with no VL test result (in red). The WHO algorithm is described in green as well as the final classification of high-risk infants. The additional risk factor included in the modified WHO algorithm is depicted in red as well as the final classification of high-risk infants. Percentages were calculated using as denominator the number of mothers from the preceding classification step. ART = Antiretroviral treatment; VL = Viral Load