With BA.2 now spreading in more than 50 countries around the world, there’s early hope that vaccine booster doses still hold up against the Omicron subvariant.
An initial analysis of vaccine effectiveness by U.K. scientists found a similar level of protection against both siblings in the Omicron evolutionary family tree: BA.1, which is still dominant globally, and BA.2, which is rising in multiple countries.
In the findings released on Thursday, which combined results from all COVID-19 vaccines being used in the U.K., the effectiveness in warding off symptomatic infection after two doses was nine per cent against BA.1 and 13 per cent
