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  1. Vaccines and immunization: What is vaccination?

    Oct 22, 2025 · The vaccine is therefore a safe and clever way to produce an immune response in the body, without causing illness. Our immune systems are designed to remember. Once …

  2. COVID-19 vaccines - World Health Organization (WHO)

    Criteria for COVID-19 vaccine prioritization The proposed attributes and criteria provide considerations for the evaluation and prioritization of COVID-19 candidate vaccines to be …

  3. How do vaccines work? - World Health Organization (WHO)

    Feb 25, 2025 · This article is part of a series of explainers on vaccine development and distribution. Learn more about vaccines – from how they work and how they’re made to …

  4. Vaccines and immunization - World Health Organization (WHO)

    Nov 6, 2025 · Vaccination is a simple, safe, and effective way of protecting people against harmful diseases, before they come into contact with them. It uses your body’s natural defences to …

  5. What's in a vaccine? - World Health Organization (WHO)

    Sep 4, 2025 · Live-attenuated vaccine A live-attenuated vaccine uses a living but weakened version of the virus or one that’s very similar. The measles, mumps and rubella (MMR) vaccine …

  6. Vaccine efficacy, effectiveness and protection

    Mar 10, 2025 · Vaccine protection and timing Vaccines work by building strong protection against disease. Some vaccines require only one dose to build protection, while others need multiple …

  7. A Brief History of Vaccination

    For centuries, humans have looked for ways to protect each other against deadly diseases. From experiments and taking chances to a global vaccine roll-out in the midst of an unprecedented …

  8. Know the facts - World Health Organization (WHO)

    Mar 20, 2020 · Vaccination is a simple, safe, and effective way of protecting people against harmful diseases, before they come into contact with them. It uses your body’s natural …

  9. Coronavirus disease (COVID-19): Vaccines and vaccine safety

    Oct 8, 2024 · This page answers the most frequently asked questions about COVID-19 vaccines and vaccine safety. If the information you are looking for is not here, check out our related …

  10. Statement on the antigen composition of COVID-19 vaccines

    May 15, 2025 · The TAG-CO-VAC reconvened on 6-7 May 2025 to review the genetic and antigenic evolution of SARS-CoV-2; immune responses to SARS-CoV-2 infection and/or …