The World Health Organisation, which is currently tracking four potentially dangerous sub-lineages of the Omicron variant of coronavirus, said that vaccines may need to evolve as the virus is fast evolving. WHO Director General Tedros Adhanom Ghebreyesus said on Tuesday that it is premature for any country either to surrender or to declare victory. “This virus is dangerous, and it continues to evolve before our very eyes,” he said. 

WHO is currently tracking four sub-lineages of the Omicron variant of concern, including BA.2. At the same time, it is also clear that as this virus evolves, vaccines may need to evolve. Variants of SARS-CoV-2 may continue to escape neutralising antibodies induced by vaccines against prior variants, the WHO chief added.