Although the Option B Plus strategy offers an attractive rapid ART scale-up alternative to the WHO PMTCT recommendations and has the potential to profoundly impact maternal and infant outcomes, it has not been implemented in any programme setting. Operational challenges throughout the cascade of PMTCT services may affect the uptake and adherence to highly active ART treatment (HAART) by pregnant women, the follow-up of HIV-exposed infants and the long-term retention of this patient population. Several issues identified at the national level are potential threats to the successful implementation and scale up of Option B plus: a) potential suboptimal uptake of HAART by asymptomatic pregnant women due to low treatment literacy and stigma; b) low adherence to HAART and poor follow-up of HIV exposed infants; and c) lack of psycho-social support for long term retention in this relatively asymptomatic patient population (Schouten et al. 2011).