Nov 27 (Reuters) — The new Omicron coronavirus variant — identified first in South Africa, but also detected in Europe and Asia — is raising concern worldwide given the number of mutations, which might help it spread or even evade antibodies from prior infection or vaccination.

News of the variant prompted countries to announce new travel restrictions on Friday and sent drugmakers scrambling to see if their COVID-19 vaccines remain protective.

WHY ARE SCIENTISTS WORRIED?