When considering COMIRNATY for
someone you care for
it’s OK to have questions
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1 Frequently Asked Questions with the term “child”
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You can get a shot at a healthcare provider’s office, pharmacies, some hospitals, and health clinics throughout the United States.
You can also find and schedule a COVID-19 shot through our vaccine finder, if eligible. Talk to your doctor to help determine eligibility.
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An updated vaccine is different than a booster dose of a vaccine. An updated vaccine contains an “updated” formula that is anticipated to help protect against the currently circulating strains of the virus that causes COVID-19. Updated COVID-19 vaccines are made using a process similar to previous vaccine formulas.
A booster dose of a vaccine is an additional dose of the vaccine you previously received. It is given to help “boost” your immune system. Think of it this way: an updated vaccine helps provide immunity against new variants, while a booster dose of a vaccine helps restore immunity against previous variants.
The 2024-2025 formula COVID-19 vaccines are called “updated” vaccines by the FDA, not “boosters” like previous vaccines, because they build a new immune response to variants that are currently circulating, instead of restoring immunity gained from a previous vaccine.
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Tell your vaccination provider about all of your medical conditions, including if you:
- Have any allergies
- Had a severe allergic reaction after receiving a previous dose of any COVID-19 vaccine
- 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 your 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
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COVID-19 vaccines help the body develop immunity to the virus that causes COVID-19 without having to get the illness. mRNA vaccines provide instructions to the body to make a protein found on the surface of the virus that causes COVID-19. This triggers an immune response inside the body and trains the immune system to recognize and help fight the virus in the future.
Learn more about how COMIRNATY works.
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COMIRNATY was updated as recommended by the FDA to closely match circulating variants of the virus that causes COVID-19.
Due to the nature of mRNA design and production, COMIRNATY can be updated in a timely manner.
COMIRNATY is made the same way as previous formulas, with the difference only in the mRNA which encodes the viral spike proteins.
Learn more about how COMIRNATY works.
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COMIRNATY has been tested in multiple clinical trials with a demonstrated safety profile. Serious risks can include severe allergic reactions, myocarditis (inflammation of the heart muscle), or pericarditis (inflammation of the lining outside the heart). Some people may faint after vaccination and people with weakened immune systems may have a reduced immune response.
Common side effects in people 12 years of age and older include pain, swelling or redness where the shot is given, tiredness (fatigue), headaches, chills, muscle and/or joint pain, and fever. Learn more about safety.
These may not be all the possible side effects of COMIRNATY. Ask your healthcare provider about any side effects that concern you.
The CDC, FDA, and other federal agencies continue to rigorously monitor the safety of COVID‑19 vaccines, including COMIRNATY, and share information with the public as it becomes available. Learn more from the CDC.
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