New Covid subvariants BA.4, BA.5 detected in South Africa
Expert says BA.4 and BA.5 have led to a rise in sequenced Covid cases in South Africa since early March; WHO says it is monitoring several descendent lineages, including BA.4 and BA.5.
Expert says BA.4 and BA.5 have led to a rise in sequenced Covid cases in South Africa since early March; WHO says it is monitoring several descendent lineages, including BA.4 and BA.5.
