ALEXANDER WINNING SOUTH Africa should aim to cover 10% of its population via a global coronavirus vaccine scheme while also negotiating directly with manufacturers, a group of experts has advised the government. South Africa has recorded the most novel coronavirus infections of any African nation. While it has publicly expressed support for the COVAX scheme co-led by the World Health Organization, it has yet to make the formal commitment confirming its participation. The race to secure enough vaccines to protect at-risk groups is heating up following Monday's announcement by Pfizer that its vaccine candidate is more than 90% effective based…