COVID booster shots appear to be less than 20% effective against infection with the omicron variant of the virus just a few months after the booster is given, a new study found this week.
The Italian study, which is a pre-print review and re-analysis of prior studies and has not been peer-reviewed, suggests boosters are effective in the short term to restore protection against the virus. But over just a few months, that wanes quickly.
“Booster doses were found to restore the VE [vaccine effectiveness] to levels comparable to those acquired soon after administration of the second dose; however, a fast decline of booster VE against Omicron was observed, with less than 20% VE against infection and less than 25% VE against symptomatic disease at 9 months from the booster administration,” the authors wrote in the paper released Wednesday.
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