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  1. Vaccines and immunization: What is vaccination?

    Apr 23, 2024 · 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. 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 …

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

    Vaccine target product profile WHO has published the target product profiles for COVID-19 vaccines, which describes the preferred and minimally acceptable profiles for human vaccines …

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

    Feb 24, 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 …

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

    Jun 13, 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 …

  6. 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 …

  7. COVID-19 Vaccines Advice - World Health Organization (WHO)

    Oct 8, 2024 · Getting vaccinated: Specific advice Take whatever vaccine is made available to you, even if you have already had COVID-19. Hybrid immunity (protection from both vaccination …

  8. 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 …

  9. Vaccines and immunization: Vaccine safety

    Mar 26, 2025 · During the same period, vaccination has reduced infant deaths by 40%. Together with governments, vaccine manufacturers, scientists and medical experts, WHO's vaccine …

  10. Mpox: Vaccines - World Health Organization (WHO)

    Jan 22, 2025 · This page answers the most frequently asked questions about mpox vaccines. For more information about protecting yourself and others from mpox, please see our public …