COVID-19 variant detected in South Africa, with the EU and Britain among those tightening border controls as researchers sought to find out if the mutation was vaccine-resistant.Hours after Britain banned flights from South Africa and neighboring countries and asked travelers returning from there to quarantine, the World Health Organization (WHO) cautioned against hasty travel bans.The head of the UN World Tourism Organisation called for a quick decision.“It depends on WHO recommendations, but my recommendation will be to take decisions today, not after one week, because if it continues to spread as we are expecting then it will be late and will make no sense to apply restrictions,” organization chief Zurab Pololikashvili told Reuters. .