In the MITRA Plus trial from Tanzania, ART and breastfeeding was associated with a cumulative transmission at six months of only 5.0% (less than 1% had been infected during the period of breasfeeding). And in the AMATA study in Rwanda, only one out of 174 (0.6%) breastfeeding women on ART transmitted HIV to her infant — and since she had detectable viral load at the time, investigators believe that she may have discontinued her medication.
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