People vaccinated against COVID-19 are two-thirds less likely to be hospitalized because of the Omicron variant than those infected with the earlier Delta variant, a new study says.
Among those who had received two doses of the Pfizer or ModernaTwo to 4 weeks after a booster dose,effectiveness ranged from around 65-75%, dropped to 55-70% at 5 to 9 weeks, and 40-50% from 10 weeks or more after a booster dose.
The U.K. Health Security Agency worked with the Cambridge University MRC Biostatistics unit to analyze 528,176 Omicron cases and 573,012 Delta cases through Dec. 26. The data suggests that three doses of vaccine provided an estimated 68% drop in the risk of being hospitalized with Omicron compared with people who were unvaccinated.
One dose of any vaccine was tied to a 35% reduced risk of hospitalization among symptomatic cases with the Omicron variant, two doses with a 67% reduction up to 24 weeks after the second dose, and a 51% reduced risk 25 or more weeks after the second dose when compared to people who had not received a vaccine.
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