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  1. Sep 22, 2022 · Booster doses helped restore some of the vaccine’s effectiveness, bringing it back up to 61% against Omicron beginning a week after people received the booster shot. “The bottom line message ...

  2. Jan 26, 2023 · The bivalent vaccine was developed before those subvariants began circulating. Meanwhile, a study also in January from the CDC examined how effective the bivalent vaccine was against XBB and XBB.1.5, the more recent Omicron subvariants. The study found that in people who had previously received two to four monovalent vaccines doses, the ...

    • 065208055
    • carrie.macmillan@yale.edu
    • How Do The Updated Vaccines Differ from The Original ones?
    • How Effective Is The Booster Against Omicron?
    • Who Is Eligible For The Omicron Booster Right Now?
    • How Long Should I Wait If I Recently Received A Booster Shot?
    • Do I Need to Get The Updated Booster If I Just Had Covid-19?

    The FDA has been incredibly deliberate in referring to the vaccines as "updated" rather than "new," and there's an important reason for that. They're different from the original vaccines in just one small, albeit powerful, way. "The updated vaccines use the same technology as the existing ones, meaning they work the same way," says Dr. John Cooke, ...

    "Based on the data supporting their authorizations, the bivalent COVID-19 vaccines are expected to provide increased protection against the currently circulating omicron variant," says Dr. Sostman. Human clinical trials of the updated boosters are still ongoing. But while the real-world effectiveness of these vaccines isn't fully known just yet, th...

    "The bivalent COVID-19 vaccine boosters are authorized as a single dose in people who have completed their primary vaccination series, as well as those who have also received one or more booster shot already," explains Dr. Sostman. Though, if you've recently received a booster dose of the original vaccine or you've recently had COVID-19, you may no...

    "According to the FDA, you should wait until at least two months have passed since your last booster vaccination to receive the updated booster," says Dr. Sostman. This also applies to those who recently completed their primary vaccine series — you will need to wait at least two months before getting the omicron booster. "Some experts think it's be...

    Many people recently recovering from COVID-19 are likely wondering whether they'll even need the updated booster. "There are many unknowns about natural immunity to COVID-19, including how long you can expect it to protect you," says Dr. Sostman. "For this reason, relying only on natural immunity without the vaccine-based immunity isn't recommended...

  3. Aug 18, 2022 · The WHO Strategic Advisory Group of Experts on Immunization (SAGE) has issued updated interim recommendations for the use of the Moderna COVID-19 (mRNA-1273) vaccine against COVID-19. This article provides a summary of those interim recommendations; you may access the full guidance document here. Here is what you need to know.

  4. Mar 24, 2022 · Protection against IMV or death was consistent throughout the Delta and Omicron periods and was higher in adults who received a third vaccine dose, including 94% during the Omicron period. These findings reinforce the highly protective effects of up-to-date COVID-19 vaccination against severe illness and death among adults, including against ...

  5. Oct 20, 2022 · Encounters for persons who received a non-mRNA COVID-19 vaccine, only 1 dose, >4 doses, dose 2 <14 days before the index date, dose 3 or 4 <7 days before the index date, or who received doses before vaccine was recommended by ACIP were excluded. §§ The study period began on the date when ≥50% of sequenced specimens for each study site ...

  6. Dec 16, 2021 · Say 2.5% of people in the vaccinated group get COVID-19 compared with 50% in the unvaccinated group. That means the vaccine has 95% efficacy. We determine that because (50% – 2.5%)/50% = .95. So ...

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