ALEXANDER WINNING MILLIONS of coronavirus vaccine doses secured by the African Union (AU) will be allocated according to countries' population size, South African President Cyril Ramaphosa has announced. Ramaphosa, who is the current AU chairman, said on Wednesday that vaccines from Pfizer, Johnson & Johnson and AstraZeneca would be available this year, but he did not specify how much each African country would get. No African countries have begun large-scale coronavirus vaccination campaigns and the AU's 270 million shots, if administered two per person, would still only cover around 10% of the continent's 1.3 billion people. "The Africa CDC has…