Study shows COVID vaccine effectiveness against Omicron drops dramatically after 6 months

LOS ANGELES, May 4 (Xinhua) -- The effectiveness of COVID-19 vaccines against Omicron rapidly wanes over time, according to a new analysis.

This systematic review and meta-analysis of secondary data from 40 studies found that the estimated vaccine effectiveness against both laboratory-confirmed Omicron infection and symptomatic disease was lower than 20 percent at 6 months from the administration of the primary series.