While there have been a few cases of new Omicron sub-variants BA.4 and BA.5, so far there is no change seen in the severity or transmissibility, the World Health Organisation has said.
Vietnam has yet to discover the emergence of BA.4 and BA.5 – the two sublineages of the Omicron variant following genome sequencing, the Ministry of Health said on April 12 evening.
Botswana's health ministry says it had identified four cases of BA.4 and BA.5, all among people aged 30 to 50 who were fully vaccinated and experiencing mild symptoms