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What you should know about the possibility of COVID-19 illness After vaccination

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File Language:
English


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  • Corporate Authors:
    National Center for Immunization and Respiratory Diseases (U.S.)
  • Description:
    COVID-19 vaccines are effective. However, a small percentage of people who are fully vaccinated will still get COVID-19 if they are exposed to the virus that causes it. These are called “vaccine breakthrough cases.” This means that while people who have been vaccinated are much less likely to get sick, it may still happen. Experts continue to study how common these cases are.

    Large-scale clinical studies found that COVID-19 vaccination prevented most people from getting COVID-19. Research also provides growing evidence that mRNA COVID-19 vaccines offer similar protection in real world conditions. While these vaccines are effective, no vaccine prevents illness 100 percent of the time. For any vaccines, there are breakthrough cases. With effectiveness of 90 percent or higher, a small percentage of people who are fully vaccinated against COVID-19 will still get sick and some may be hospitalized or die from COVID-19. It’s also possible that some fully vaccinated people might have infections, but not have symptoms (asymptomatic infections).

  • Content Notes:
    What CDC is doing -- Establishing a vaccine breakthrough case definition -- Identifying and investigating COVID-19 vaccine breakthrough cases -- Developing a data access and management system for COVID-19 vaccine breakthrough cases -- COVID-19 vaccine breakthrough infections reported to CDC -- How to interpret these data -- COVID-19 Vaccines are Effective.
  • Subjects:
  • Document Type:
    Webpage
  • Place as Subject:
    United States
  • Collection(s):
  • Main Document Checksum:
    urn:sha256:4fd74fdb518f26d7ab1c5636d726e24ba273ad934fc08b34db812b5dd8bc7435
  • Download URL:
  • File Type:
    Filetype[PDF - 133.95 KB ]

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