Important update: Healthcare facilities
CDC has updated select ways to operate healthcare systems effectively in response to COVID-19 vaccination. Learn more
UPDATE
Given new evidence on the B.1.617.2 (Delta) variant, CDC has updated the guidance for fully vaccinated people. CDC recommends universal indoor masking for all teachers, staff, students, and visitors to K-12 schools, regardless of vaccination status. Children should return to full-time in-person learning in the fall with layered prevention strategies in place.
UPDATE
The White House announced that vaccines will be required for international travelers coming into the United States, with an effective date of November 8, 2021. For purposes of entry into the United States, vaccines accepted will include FDA approved or authorized and WHO Emergency Use Listing vaccines. More information is available here.
UPDATE
Travel requirements to enter the United States are changing, starting November 8, 2021. More information is available here.

Myocarditis and Pericarditis After mRNA COVID-19 Vaccination

Myocarditis and Pericarditis After mRNA COVID-19 Vaccination
Updated Sept. 27, 2022
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CDC and its partners are actively monitoring reports of myocarditis and pericarditis after COVID-19 vaccination. Active monitoring includes reviewing data and medical records and evaluating the relationship to COVID-19 vaccination.

Information about CDC’s ongoing study of myocarditis after COVID-19 vaccination can be found here: Investigating Long-Term Effects of Myocarditis | CDC

Myocarditis is inflammation of the heart muscle.

Pericarditis is inflammation of the outer lining of the heart.

  • In both cases, the body’s immune system causes inflammation in response to an infection or some other trigger. Learn more about myocarditis and pericarditis. Both myocarditis and pericarditis have the following symptoms:
  • Chest pain
  • Shortness of breath
  • Feelings of having a fast-beating, fluttering, or pounding heart

Myocarditis and pericarditis have rarely been reported. When reported, the cases have especially been in adolescents and young adult males within several days after mRNA COVID-19 vaccination (Pfizer-BioNTech or Moderna).

  • More often after the second dose
  • Usually within a week of vaccination
  • Most patients with myocarditis or pericarditis who received care responded well to medicine and rest and felt better quickly.
  • Patients can usually return to their normal daily activities after their symptoms improve.
  • Those who have been diagnosed with myocarditis should consult with their cardiologist (heart doctor) about return to exercise or sports.

Seek medical care if you or your child have any of the specific or general symptoms of myocarditis or pericarditis especially if it’s within a week after COVID-19 vaccination.

Healthcare Providers: For additional recommendations and clinical guidance, visit Clinical Considerations: Myocarditis after mRNA COVID-19 Vaccines.

Should I Still Get Myself or My Child Vaccinated?

Yes. CDC continues to recommend that everyone ages 6 months and older get vaccinated for COVID-19. The known risks of COVID-19 illness and its related, possibly severe complications, such as long-term health problems, hospitalization, and even death, far outweigh the potential risks of having a rare adverse reaction to vaccination, including the possible risk of myocarditis or pericarditis.

If you have already gotten the first dose of Pfizer-BioNTech or Moderna vaccine, or if your child has already gotten the first dose of the Pfizer-BioNTech vaccine, it’s important to get the second dose unless a vaccination provider or your doctor tells you not to get it.

If you have concerns about COVID-19 vaccination, talk with your healthcare provider or your child’s doctor, nurse, or clinic.

If you have any health problems after vaccination, report them to VAERS.