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Aug 22, 2021 · Learn the differences between the AstraZeneca vs. Pfizer vaccines, including how they work, how many doses are needed, and how effective they are over time.
Apr 24, 2024 · First introduced in December 2020, the original COVID mRNA vaccines from both Pfizer and Moderna protected against the original SARS-CoV-2 virus. They were replaced in September 2022 by “bivalent” vaccines, which targeted both the original virus and Omicron variants BA.4 and BA.5.
2023-2024 Pfizer-BioNTech vaccine is authorized for people ages 6 months through 11 years. Comirnaty is approved for people age 12 and older. The vaccines that help protect against COVID-19 are safe and effective based on clinical trials and continued monitoring.
Mar 2, 2022 · Vaccine effectiveness was calculated after primary immunization with two doses of BNT162b2 (Pfizer–BioNTech), ChAdOx1 nCoV-19 (AstraZeneca), or mRNA-1273 (Moderna) vaccine and after a booster...
Jul 21, 2021 · In this study, we aimed to estimate the effectiveness of two Covid-19 vaccines, BNT162b2 and ChAdOx1 nCoV-19 (AstraZeneca), against symptomatic disease caused by the delta variant.
Mar 29, 2022 · A rare head-to-head comparison shows that the COVID-19 vaccines made by Pfizer and Moderna outperform those from Johnson & Johnson and Novavax 1. The data also provide a finely detailed picture...
Jan 3, 2022 · The UK's Medicines and Healthcare Products Regulatory Agency (MHRA) gave emergency use authorisation to three vaccines against COVID-19 between December 2020 and January 2021, namely the Pfizer/BioNTech BNT162b2 mRNA, Oxford/AstraZeneca ChAdOx1 nCoV-19 adenoviral AZD1222; and Moderna mRNA-1273 vaccines.
