Omicron lineages BA.4 and BA.5 FAQ
1. What are BA.4 and BA.5? BA.4 and BA.5 are two newly-designated Omicron lineages. They are currently still classified as the Omicron variant, meaning that they are not a new Variant of Concern (VOC); rather, they are Omicron viruses with a new combination of mutations. In terms of their mutations, BA.4 and BA.5 share mutations […]