The World Health Organisation (WHO) is concerned with the mutations of Omicron sub-variants BA.4 and BA.5 besides the dominance of the BA.2 globally. WHO chief Tedros Adhanom Ghebreyesus says the BA.4 and BA.5 are driving a new surge in South Africa.  “The BA.4 and BA.5 sub-variants were identified because South Africa is still doing the … Continue reading Covid-19: We Don’t Know What’s Coming Next- WHO