GUILIA PARAVICINI AN extended halt to exports of COVID-19 vaccines from India, where authorities are battling a wave of domestic infections, risks derailing vaccination efforts already underway in Africa, one of the continent's top health officials said yesterday. India stopped vaccine exports a month ago and, according to a Reuters report earlier on Tuesday, is now unlikely to resume major exports before October, dealing a major setback to the global COVAX initiative on which many poor countries rely. Africa has lagged far behind other regions due to supply issues and meagre financial resources but had planned to vaccinate 30-35% of…