We don't know yet. Studies show that the vaccines prevent severe COVID-19 disease, but we need more time to find out if they also prevent infection with or transmission of coronavirus.
The studies have shown the COVID-19 vaccines are effective at preventing severe disease. This is important for the vaccinated people and their communities. It means people don't need so much time away from work or their families, and it means that the burden on hospitals and healthcare systems is reduced. We don't know yet if COVID-19 vaccines also prevent infection or prevent transmitting the virus to others. If people who are vaccinated can still get infected and transmit the virus to others, it will be harder to achieve population immunity.
We need the research to continue to help us find this answer.
Until we know if COVID-19 vaccines protect against infection, masks are still needed to stop the spread of coronavirus. Masks are the best way to stop the spread of droplets from your mouth and nose to others.
We need your help to keep learning and improving vaccines against COVID-19. We made history with safe and effective vaccines and we’ll keep working as long as there are people to protect, variants emerging, and research answers needed to end this pandemic. To participate:
Content last reviewed on May 12, 2021