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  1. 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 …

  2. How vaccines work - World Health Organization (WHO)

    Sep 24, 2015 · Vaccines are widely and routinely administered around the world, based on the common-sense principle prevention is better than treatment. Vaccines typically provide the …

  3. 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 …

  4. Vaccines and immunization: What is vaccination?

    Oct 22, 2025 · Vaccines protect us throughout life and at different ages, from birth to childhood, as teenagers and into old age. In most countries you will be given a vaccination card that tells …

  5. Vaccines explained - World Health Organization (WHO)

    Feb 25, 2025 · Vaccine explainers"Vaccines Explained" is a series of illustrated articles that describe how vaccines work, how they’re developed and distributed and how their safety is …

  6. Episode #16 - COVID-19 - How do vaccines work?

    How do vaccines work to protect us? What are the vaccine technologies in the pipeline and how do we ensure safe vaccines? Dr Katherine O’ Brien explains in Science in 5 !

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

    How do vaccines work? This article is part one in a series of explainers on vaccine development and distribution. This article focuses on how vaccines work to protect our bodies from disease …

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

    Dec 18, 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 …

  9. HOW VACCINES WORK Vaccines contain a modified form of virus or bacteria that doesn’t cause disease, but does “teach” your immune system what to do if you are ever attacked by the real, …

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

    Sep 4, 2025 · Learn more about vaccines – from how they work to how they’re made – in WHO’s Learn more about vaccines – from how they work to how they’re made – in WHO’s Vaccines …