
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 …
COVID-19 vaccines - World Health Organization (WHO)
The COVID-19 global health emergency saw the fastest vaccine rollout the world has ever seen. Now it’s time to share just how remarkable that journey really was. The Delivery is a tool that …
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 …
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 …
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 …
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 …
Vaccines and immunization: Dengue
Apr 10, 2025 · TAK-003 is a live-attenuated vaccine containing weakened versions of dengue virus serotypes 1, 2, 3 and 4 developed by Takeda. TAK-003 uses the DENV2 strain as the …
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 …
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 …
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 …