Pfizer confirm COMIRANTY "vaccine show increased risks of myocarditis and pericarditis"

Pfizer issued a press release Friday afternoon stating definitively that mRNA covid vaccines “show increased risks” of myocarditis + pericarditis.

Highest risk = adolescent males.



COMIRNATY® (COVID-19 Vaccine, mRNA) is a vaccine approved for active immunization to prevent coronavirus disease 2019 (COVID-19) caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in individuals 12 years of age and older.


  • You shouldNOTreceive COMIRNATY® (COVID-19 Vaccine, mRNA) if you have had a severe allergic reaction to any ingredient of COMIRNATY or a previous dose of a Pfizer-BioNTech COVID-19 vaccine
  • There is a remote chance that COMIRNATY could cause a severe allergic reaction. A severe allergic reaction would usually occur within a few minutes to 1 hour after getting a dose of the vaccine. For this reason, your vaccination provider may ask you to stay at the place where you received the vaccine for monitoring after vaccination. If you or your pre-teen or teenager experience a severe allergic reaction, call 9-1-1 or go to the nearest hospital. Signs of a severe allergic reaction can include:
    • difficulty breathing, swelling of the face and throat, a fast heartbeat, a bad rash all over the body, dizziness and weakness
  • Authorized or approved mRNA COVID-19 vaccines show increased risks of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the lining outside the heart), particularly within the first week following vaccination. For COMIRNATY, the observed risk is highest in males 12 through 17 years of age. Seek medical attention right away if you have any of the following symptoms after receiving the vaccine, particularly during the 2 weeks after receiving a dose of the vaccine:
    • chest pain
    • shortness of breath
    • feelings of having a fast-beating, fluttering, or pounding heart
  • Additional symptoms, particularly in children, may include:
    • Fainting
    • Unusual and persistent fatigue or lack of energy
    • Persistent vomiting
    • Persistent pain in the abdomen
    • Unusual and persistent cool, pale skin
  • Fainting can happen after getting injectable vaccines including COMIRNATY. Your vaccination provider may ask you to sit or lie down for 15 minutes after receiving the vaccine
  • People with weakened immune systems may have a reduced immune response to COMIRNATY
  • COMIRNATY may not protect all vaccine recipients
  • Tell your vaccination provider about all of your medical conditions, including if you:
    • have any allergies
    • have had myocarditis (inflammation of the heart muscle) or pericarditis (inflammation of the lining outside the heart)
    • have a fever
    • have a bleeding disorder or are on a blood thinner
    • are immunocompromised or are on a medicine that affects the immune system
    • are pregnant, plan to become pregnant, or are breastfeeding
    • have received another COVID-19 vaccine
    • have ever fainted in association with an injection
  • The most commonly reported adverse reactions (≥10%) after a dose of COMIRNATY were pain at the injection site (up to 90.5%), fatigue (up to 77.5%), headache (up to 75.5%), chills (up to 49.2%), muscle pain (up to 45.5%), joint pain (up to 27.5%), fever (up to 24.3%), injection site swelling (up to 11.8%), and injection site redness (up to 10.4%).

These may not be all the possible side effects of the vaccine. Call the vaccination provider or healthcare provider about bothersome side effects or side effects that do not go away.