Being boosted with a COVID vaccine is optimal, but booster protection against the Omicron variant declines after about 10 weeks.
Booster shot effectiveness against the Omicron coronavirus variant wanes faster than it does against Delta, according to new data collected in the United Kingdom. The data shows the booster vaccines’ protection against Omicron drops significantly after about 10 weeks.released data on 147,597 Delta and 68,489 Omicron cases, using the country’s vaccination information to assess the longevity of the AstraZeneca, Pfizer, and Moderna vaccines and boosters.
Recipients of three Pfizer doses started with 70 percent effectiveness against Omicron one week after the booster. That protection dropped to 45 percent after 10 weeks. Those who were initially double-dosed with Pfizer, but then received a Moderna booster, stayed at around 75 percent effectiveness at up to nine weeks post-booster administration.
The report also confirms that Omicron is less severe than Delta—those infected with Omicron have about a 50 percent less chance of needing hospitalization. But public healththat Omicron would need to be 90 percent less severe than delta for hospitalizations to not reach the levels of previous peaks.
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