Home LATEST NEWS Highly Effective Vaccines Against Severe Omicron Cases, Study Confirms | Coronavirus

Highly Effective Vaccines Against Severe Omicron Cases, Study Confirms | Coronavirus

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This study from the Centers for Disease Control and Prevention (CDC)Have (New window)Have reviews data from more than 300,000 ER visits, urgent care clinics and hospitalizations in 10 states from August 26, 2021 to January 5, 2022.

During the period when the Delta variant was dominant, vaccine efficacy against COVID-19 hospitalizations was:

  • 90% between 14 and 179 days after the second dose of vaccine;
  • 81% more than 180 days after the second dose;
  • 94% 14 days or more after the third dose.

Once Omicron became dominant, vaccine efficacy against hospitalizations was:

  • 81% between 14 and 179 days after the second dose;
  • by 57% after more than 180 days after the second dose;
  • 90% 14 days or more after the third dose.

A second study, based on data from 25 US states and local jurisdictions, shows that vaccine effectiveness against infections increased from 93%, before Delta, to about 80% once Delta became dominant; but death protection remained stable (and high) at 94%.

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The importance of the booster dose

Efficacy against infections dropped to 68% with Omicron. The authors were unable to derive an estimate of vaccine protection against death during Omicron due to a delay in recording information, but scientists widely expect it to remain. very high.

The study also shows that while deaths among fully vaccinated people increased markedly during the Delta wave (more than 20,000 people between July and November), unvaccinated people were 16 times more likely to die during the same period.

Protection was even greater for people who received a booster dose. Between October and November, unvaccinated people were 50 times more likely to die from COVID-19 than vaccinated people who received a booster.

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