Today on The Discourse - a growing global row over access to a breakthrough HIV prevention drug. Médecins Sans Frontières says efforts to secure lenacapavir for use in its programmes have been blocked, despite the medicine being hailed as a game-changer in the fight against HIV. The organisation argues that limited supply and restrictive licensing are keeping life-saving treatment out of reach for some of the world's most vulnerable communities. At the same time, South Africa is preparing for a phased rollout of the injectable, which can provide protection against HIV for up to six months at a time-raising fresh questions about equity, pricing, and global access to medical innovation.  So who gets access first-and who is left behind?  Peter Ndoro spoke to Dr Tom Ellman, Director of MSF's Southern Africa Medical Unit, and Fatima Hassan, Founder and Director of the Health Justice Initiative in South Africa.