SINGAPORE says it will stop allowing entry to visitors with a recent travel history to South Africa, citing reports of a potentially more contagious strain of the novel coronavirus circulating in the country. All long-term pass holders and short-term visitors with travel history to South Africa within the last 14 days will not be allowed entry into the city-state, or transit through it, the health ministry said. Returning Singapore citizens and permanent residents will be required to undergo a COVID-19 polymerase chain reaction (PCR) test upon arrival at the start of a 14-day quarantine. "While the strain has been suggested…