Monovalent COVID booster protects well against Omicron, but it wanes over 6 months --study

Monovalent COVID booster protects well against Omicron, but it wanes over 6 months The COVID-19 booster was 74% effective against Omicron infection compared with the primary vaccine series for 3 months, but protection waned to 36% after 6 months. CIDRAP

The monovalent (single-strain) COVID-19 vaccine booster was 74% effective against Omicron infection compared with the primary vaccine series for 3 months, but protection waned to 42% from 3 to 6 months and 36% after 6 months, estimates a study published yesterday in Influenza and Other Respiratory Viruses.

"Increasing bivalent booster uptake should be a priority to increase protection likely lost due to waning immunity."