THERE is no indication that the coronavirus variant identified in South Africa is more transmissible than the one spreading fast in Britain, the World Health Organization's technical chief on COVID-19, Maria Van Kerkhove, has said.  Van Kerhove said this as Britain began its third lockdown after Prime Minister Boris Johnson said a coronavirus variant first identified in Britain was spreading so fast it risked overwhelming the National Health Service within 21 days. UK scientists also expressed concern that vaccines being rolled out in Britain may not be able to protect against another variant that emerged in South Africa. The following…