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Meeting report on water, sanitation and hygiene in health-care facilities in the WHO European Region: Budapest, Hungary, 2–4 July 2025

Water, sanitation and hygiene (WASH) services, including waste management and environmental cleaning, are fundamental to quality care, infection prevention...

Prevalence of Legionella as a waterborne pathogen and its health impacts in the pan-European region

Legionella infections represent a significant health burden in the pan-European region; in many countries it is considered among the most important waterborne...

Two decades of the implementation of the WHO Framework Convention on Tobacco Control in the European Union: progress, challenges and the road ahead

This report marks twenty years since the European Union (EU) signed the WHO Framework Convention on Tobacco Control (WHO FCTC) and reflects on the EU’s...

WHO European Childhood Obesity Surveillance Initiative (COSI): report on the sixth round of data collection, 2022– 2024

Unhealthy bodyweight in children affects physical and mental health, school performance and quality of life, while also raising the risk of obesity and...



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A quick guide - vaccination against COVID-19 with the ChAdOx1-S [recombinant] COVID-19 vaccine (2021)

Overview

This quick guide offers basic information about COVID-19, the ChAdOx1-S [recombinant] COVID-19 vaccine and what to expect following vaccination.

  1. What is COVID-19?
  2. Who is most at risk from COVID-19?
  3. Why get vaccinated against COVID-19?
  4. How is the vaccine given?
  5. How does the ChAdOx1-S [recombinant] COVID-19 vaccine work?
  6. Does the vaccine cause side effects?
  7. What should I do in case of side effects?
  8. Could I get a severe allergic reaction?
  9. Is the ChAdOx1-S [recombinant] COVID-19 vaccine safe?
  10. What are blood clots? How do they develop? What are platelets?
  11. Are some blood clots dangerous? What happens if my platelet levels are too low?
  12. Does the vaccine work in everyone?
  13. Who should not get the ChAdOx1-S [recombinant]COVID-19 vaccine?
  14. I already had COVID-19. Should I still get vaccinated?
  15. I currently have COVID-19. Can I still get vaccinated?
  16. I am pregnant (or breastfeeding). Should I still get vaccinated?
  17. I am an older adult. Is it safe for me to take the vaccine? Does the vaccine work for older adults?
  18. Is the ChAdOx1-S [recombinant] COVID-19 vaccine safe for persons with medical conditions?
  19. Can children and adolescents below 18 years receive the ChAdOx1-S [recombinant] COVID-19 vaccine?
  20. How many doses do I need?
  21. Can I receive the COVID-19 vaccine on the same day as another vaccine?
  22. How long does it take the vaccine to work?
  23. After getting vaccinated, do I still need to continue with protective measures?
  24. What are the ingredients of an ChAdOx1-S [recombinant] COVID-19 vaccine?
WHO Team
Vaccine-Preventable Diseases and Immunization (VIF)
Editors
WHO/Europe
Number of pages
6
Copyright
World Health Organization Regional Office for Europe