BA.4, BA.5

Illustration: Collected
Covid-19 in Bangladesh

Omicron BA.5 most predominant Covid sub-variant in Bangladesh: icddr,b

A person presenting with symptoms gets tested for the coronavirus disease (Covid-19) at a drive up testing center in Columbus, Ohio, US, 2 December, 2021. PHOTO: REUTERS/Gaelen Morse
Coronavirus chronicle

Covid's new Omicron sub-lineages can dodge immunity from past infection, study says