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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.
Vaccines and immunization - World Health Organization (WHO)
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 build resistance to specific infections and makes your immune system stronger.
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.
Vaccines and immunization: Vaccine safety - World Health Organization (WHO)
Vaccination is one of the most effective ways to prevent diseases. Over the past 50 years, essential vaccines against just 14 diseases have saved at least 154 million lives (1). During the same period, vaccination has contributed to 40% of the drop in infant deaths. Together with governments, vaccine manufacturers, scientists and medical experts, WHO's vaccine safety programme is constantly ...
Know the facts - World Health Organization (WHO)
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 build resistance to specific infections and makes your immune system stronger.
Vaccines WPRO - World Health Organization (WHO)
Vaccines are available to prevent more than 20 life-threatening diseases, helping people live longer, healthier lives. They reduce risks of getting a disease by working with your body’s natural defenses to build protection. When you get a vaccine, your immune system responds.
Recommendations for influenza vaccine composition for the 2026-2027 ...
The World Health Organization (WHO) today announced recommendations for the viral composition of influenza (or “flu”) vaccines for the 2026-2027 northern hemisphere influenza season. The announcement was made following a 4-day consultation examining global influenza surveillance data.
Statement on the antigen composition of COVID-19 vaccines
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 COVID-19 vaccination; the performance of currently approved vaccines against circulating SARS-CoV-2 variants; and the implications for COVID-19 vaccine antigen composition.
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 ...
WHO prequalifies an additional novel oral polio vaccine, strengthening ...
The World Health Organization (WHO) has prequalified an additional novel oral polio vaccine type 2 (nOPV2), further strengthening the global supply of a vaccine at the heart of efforts to stop poliovirus type 2 outbreaks more sustainably and accelerate progress towards polio eradication.
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