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Vaccine efficacy and duration of protection

Are COVID-19 vaccines effective against Omicron subvariant BA.2?

COVID-19 vaccines likely offer strong protection against symptomatic disease caused by the fast-spreading Omicron subvariant BA.2.

According to recent data from the UK [^1], vaccine effectiveness against symptomatic disease was similar for BA.1 and BA.2 sublineages of Omicron; and vaccines offered 70% (58-79%) protection against symptomatic COVID-19 caused by BA.2 two weeks after the booster dose.

 

References:

  1. UK Health and Security Agency. COVID-19 vaccine surveillance report. Week 4. 27 January 2022. Available at:
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