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  1. Coronavirus Disease 2019 (COVID-19)

COVID-19 Frequently Asked Questions

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Along with other federal, state, and local agencies and public health officials across the country, the FDA continues critical work to protect public health during the COVID-19 pandemic. Find the most recent FDA updates on our Coronavirus Disease 2019 page. 

The Centers for Disease Control and Prevention (CDC) has basic information about COVID-19 on their website at www.cdc.gov/coronavirus.

The frequently asked questions (FAQs) on this page are for a general public or consumer audience. Other audiences may want to refer to additional FAQs:

General Information 


Vaccines, Biologics, Human Tissues, and Blood Products

A: Everyone ages 16 and older can get a booster shot.

The FDA amended the emergency use authorization (EUA) for the Pfizer-BioNTech COVID-19 Vaccine to allow for the use of a single booster dose for people ages 16 and 17 after completion of primary vaccination with the Pfizer-BioNTech COVID-19 Vaccine.

The FDA-authorized Pfizer-BioNTech COVID-19 Vaccine and the FDA-approved Comirnaty (COVID-19 Vaccine, mRNA) are the only COVID-19 vaccines currently available for people  ages 16 and 17. Individuals ages 16 and 17 should only receive the Pfizer-BioNTech Vaccine or Comirnaty as their booster dose.

If you are 18 or older and received the Pfizer-BioNTech COVID-19 Vaccine, Moderna COVID-19 Vaccine or Comirnaty (COVID-19 Vaccine, mRNA) for your primary vaccination series at least 6 months ago, then you may receive a booster dose of any of the currently available COVID-19 vaccines. They are:

  • Moderna COVID-19 Vaccine
  • Pfizer-BioNTech COVID-19 Vaccine
  • Comirnaty (COVID-19 Vaccine, mRNA)
  • Janssen (J&J) COVID-19 Vaccine

If you are 18 or older and received the Janssen (J&J) COVID-19 Vaccine as your primary vaccination at least 2 months ago, then you may receive a booster dose of any of the currently available COVID-19 vaccines.

The FDA-approved Comirnaty (COVID-19 Vaccine, mRNA) and the two authorized formulations of Pfizer-BioNTech COVID-19 Vaccine for ages 12 and older, when prepared according to their respective instructions for use, can be used interchangeably without any safety or effectiveness concerns.


Drugs (Medicines)


Medical Devices Including Tests for COVID-19


Food Products


Animals, Pets and Animal Drug Products

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