Cases of a sub-variant of coronavirus first discovered at the end of last year are spreading fast around the globe, the World Health Organisation has warned.
BA.2 – which the UK Health Security Agency (UKHSA) has marked as a “variant under investigation” – is a sub-lineage of the Omicron strain, BA.1, with early data suggesting it may be both more transmissible and better able to evade vaccines than previous Covid variants.
