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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.
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.
Sep 30, 2021 · AstraZeneca and Pfizer's effectiveness against symptomatic disease started waning from about the 10-week mark, but they both still provided very high levels of protection, especially against hospital admission and death. Why some fully vaccinated people are still at risk.
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.
Mar 12, 2022 · A test-negative case-control design has reported that single dose of either the Oxford-AstraZeneca or Pfizer-BioNTech vaccine had 60–70% protection against symptomatic COVID-19 and about 80% effectiveness against COVID-19 hospital admission.
