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- Vaccines and immunization: What is vaccination?
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 exposed to one or more doses of a vaccine, we typically remain protected against a disease for years, decades or even a lifetime This is what makes vaccines so effective
- 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 for long term protection of persons at high ongoing risk of COVID-19, and for reactive use in outbreak settings with rapid onset of immunity
- Coronavirus disease (COVID-19): Vaccines and vaccine safety
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 links on the right-hand side of the page
- How do vaccines work? - World Health Organization (WHO)
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 ensuring safety and equitable access – in WHO’s Vaccines Explained series
- COVID-19 Vaccines Advice - World Health Organization (WHO)
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 and COVID-19 infection) enhances protection against severe disease of future COVID-19 infections and confers longer protection Revaccination approximately 12 months after the previous dose is particularly important for
- Whats in a vaccine? - World Health Organization (WHO)
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 and the chickenpox and shingles vaccine are examples of this type of vaccine This approach uses similar technology to the inactivated vaccine and can be manufactured at scale
- Vaccine efficacy, effectiveness and protection
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 doses spaced apart – called the primary series – to develop full protection
- Vaccines and immunization: Vaccine safety
During the same period, vaccination has reduced infant deaths by 40% Together with governments, vaccine manufacturers, scientists and medical experts, WHO's vaccine safety programme is constantly helping monitor the safety of vaccines This helps ensure that vaccines are safe for you and your family
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