Booster protection from omicron hospital stay dips from 91% to 78%

A vial containing the Moderna COVID-19 booster vaccine at the Vaccination Center.
expansion / / A vial containing the Moderna COVID-19 booster vaccine at the Vaccination Center.

COVID-19 booster doses have largely withstood hyperinfectious Omicron mutants, despite the fact that protection inevitably diminishes over time. Recent studies published by the Centers for Disease Control and Prevention..

Nonetheless, studies show that the inevitable decline of boosters and Omicron’s ability to fend off some immune responses may require a fourth dose in the future to maintain or improve protection against COVID-19. The author states.

Published in a weekly report on CDC morbidity and mortality, this study estimated the booster effect on severe illness and hospitalization. The booster effect decreased slightly from less than 2 months after booster administration to more than 4-5 months after the third jab. The latter time frame is the latest with available booster data based on when shots became widely available. The study collected data from patients in 10 states, including more than 240,000 visits to emergency rooms and centers and more than 93,000 hospitalizations.

Overall, booster doses significantly improved protection against Omicron and were primarily retained for long periods of time. In people who received a third dose of either mRNA vaccine within two months, the booster was estimated to be 91% effective against hospitalization for Omicron infection. At a distance of 2-3 months from the booster, the estimated efficacy of the vaccine dropped to 88%. Efficacy dropped to 78% over 4 months.

A third dose of the mRNA vaccine given within 2 months was 87% effective in terms of protection from emergency room and emergency room visits caused by Omicron. The effect dropped to 81% 2-3 months after the booster and 66% more than 4 months after the shot. The study also included data on 18 COVID-19 patients who were more than 5 months old after the third injection and needed urgent or urgent care. From those patients, the authors of the study estimated 31 percent vaccine efficacy. However, the numbers are too small to be a reliable calculation. The 95% confidence interval for the calculation ranged from -50 to 68.


It may seem that 66% efficacy at 4 months is also a concern, but it is important to note that the study authors also estimated the efficacy of the two shots. At least 5 months after the two injections, the vaccine was only 37% effective for emergency or urgent care visits for Omicron infections.

The study was a powerful design. The test-negative setting compared the odds of unvaccinated and vaccinated people tested positive for COVID-19 using the model. These models described calendar weeks and each patient’s location, age, local viral infection level, immunodeficiency status, additional underlying health status, and other factors.

However, there were some restrictions. As mentioned above, small amounts of data on people who are more than 5 months away from boost immunization make estimates of vaccine efficacy for that time frame unreliable.The study was also unable to distinguish Third dose and booster immunization without immune protectionIt is recommended to take a third dose as part of the primary series When Later booster dose. People with moderate to severe immunity are advised to obtain a primary series of triple doses, as two doses alone do not provide the same level of protection found in non-immunized individuals. I recommend it. Therefore, if this study finds that people with weakened immunity are receiving a third dose instead of a fourth, the estimated efficacy may be lower.

Overall, the authors of the study concluded that the data insisted on boosters, even if they weren’t the last shots needed. “These findings underscore the importance of receiving a third dose of the mRNA COVID-19 vaccine to prevent both COVID-19-related ED / UC. [emergency department and urgent care] Encounters among adults and hospitalization with COVID-19 “, they conclude. 19 Related ED / UC encounters and COVID-19 hospitalization. “

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