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New CDC data show that the updated COVID-19 vaccines were effective against COVID-19 during September 2023 – January 2024, including against the different circulating virus variants such as JN.1 and XBB. Getting vaccinated now can help lower the risk of becoming infected with or dying from COVID-19.
What to know. Vaccine effectiveness is a measure of how well vaccination works under real-world conditions to protect people against health outcomes such as infection, symptomatic illness, hospitalization, and death. What CDC is doing.
Detecting changes in COVID-19 vaccine effectiveness due to waning of vaccine-induced protection and emergence of new variants. Including populations at high risk for severe COVID-19. Communicating findings to policy makers, the scientific community, the public, and other stakeholders.
Our findings provide insights for clinicians, public health-care policy makers, and researchers about the long-term vaccine effectiveness of COVID-19 vaccines, which can inform clinical and policy recommendations, such as the timing of future booster doses.
All COVID-19 vaccines approved by WHO for emergency use listing have been through randomized clinical trials to test their quality, safety and efficacy. To be approved, vaccines are required to have a high efficacy rate of 50% or above.
We used a Cox regression model to estimate the effectiveness of the BNT162b2 (Pfizer–BioNTech), mRNA-1273 (Moderna), and Ad26.COV2.S (Johnson & Johnson–Janssen) vaccines in reducing the ...
The good news is that vaccines, which have been updated each year since 2022, are still expected to be effective at preventing severe disease, hospitalization, and death from COVID. In the U.S., infants, children, and adults ages 6 months and older are eligible to be vaccinated, according to the Centers for Disease Control and Prevention (CDC).
Ranking by reported efficacy gives relative risk reductions of 95% for the Pfizer–BioNTech, 94% for the Moderna–NIH, 91% for the Gamaleya, 67% for the J&J, and 67% for the AstraZeneca–Oxford vaccines.
Effectiveness. Helps protect people of all ages against COVID-19 illness that is severe, requires hospital care, or causes death. Doses. Pfizer-BioNTech COVID-19 vaccine 2024-2025 formula. Age 6 months to 4 years, unvaccinated: 3 doses. Age 6 months to 4 years, unvaccinated, weakened immune system: 3 doses.
Randomized, placebo-controlled, phase 3 trials in the United States, conducted before the emergence of the omicron variant, showed initial protective efficacy of 94 to 95% against...