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  1. www.who.int › news-room › questions-and-answersVaccines 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 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.

  2. www.who.int › health-topics › vaccines-and-immunizationVaccines and immunization - World Health Organization (WHO)

    Aug 16, 2024 · Vaccines and immunization. Immunization is a global health success story, saving millions of lives every year. Vaccines 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. We now have vaccines to prevent more than 20 life-threatening diseases ...

  3. www.who.int › novel-coronavirus-2019 › covid-19-vaccinesCOVID-19 vaccines - World Health Organization (WHO)

    COVID-19 vaccines. Everyone, everywhere, should have access to COVID-19 vaccines. Major progress has been made with the COVID-19 vaccination response, and it is critical to continue the progress, particularly for those most at risk of disease. WHO recommends a simplified single-dose regime for primary immunization for most COVID-19 vaccines ...

  4. www.who.int › item › coronavirus-disease-(covid-19)-vaccinesCoronavirus disease (COVID-19): Vaccines and vaccine safety

    Dec 5, 2023 · Protein-based vaccines: These contain harmless fragments of proteins or protein shells that mimic the COVID-19 virus to safely generate an immune response, Viral vector vaccines: These use a safe virus that cannot cause disease but serves as a vehicle to produce coronavirus proteins to generate an immune response, and

  5. www.who.int › feature-stories › detailHow do vaccines work? - World Health Organization (WHO)

    Dec 8, 2020 · How vaccines help. Vaccines contain weakened or inactive parts of a particular organism (antigen) that triggers an immune response within the body. Newer vaccines contain the blueprint for producing antigens rather than the antigen itself. Regardless of whether the vaccine is made up of the antigen itself or the blueprint so that the body will ...

  6. www.who.int › news-room › spotlightA Brief History of Vaccination - World Health Organization (WHO)

    In 1872, despite enduring a stroke and the death of 2 of his daughters to typhoid, Louis Pasteur creates the first laboratory-produced vaccine: the vaccine for fowl cholera in chickens. In 1885, Louis Pasteur successfully prevents rabies through post-exposure vaccination. The treatment is controversial. Pasteur has unsuccessfully attempted to ...

  7. www.who.int › travel-advice › vaccinesVaccines and travel - World Health Organization (WHO)

    These vaccines are recommended to provide protection against diseases endemic to the country of origin or of destination. They are intended to protect travellers and to prevent disease spread within and between countries. Some countries require proof of vaccination for travellers wishing to enter or exit the country.

  8. www.who.int › covid-19-vaccines › adviceCOVID-19 Vaccines Advice - World Health Organization (WHO)

    Dec 5, 2023 · Currently approved COVID-19 vaccines, including those based on the index virus and the bivalent vaccines, continue to protect against severe disease. For people at a high risk of getting severe COVID-19, a dose of any available vaccine is more beneficial than delaying vaccination. Many COVID-19 manufacturers have developed or are in the process ...

  9. www.who.int › detail › how-to-talk-about-vaccinesHow to talk about vaccines - World Health Organization (WHO)

    May 19, 2021 · Vaccines are safe, effective and an important part of the COVID-19 response – but stopping the spread of disease remains key. Remind people that they should keep taking other precautions, such as physical distancing, wearing a mask, keeping rooms well ventilated, avoiding crowds, cleaning hands, and coughing into a bent elbow or tissue.

  10. www.who.int › detail › how-are-vaccines-developedHow are vaccines developed? - World Health Organization (WHO)

    Dec 8, 2020 · If the vaccine triggers an immune response, it is then tested in human clinical trials in three phases. Phase 1. The vaccine is given to a small number of volunteers to assess its safety, confirm it generates an immune response, and determine the right dosage. Generally in this phase vaccines are tested in young, healthy adult volunteers.