Mighty Blog

COVID-19 vaccine doses: what you need to know

Updated 11/2/2021

There is a lot of information about additional COVID-19 vaccine doses going around and it may seem confusing. Don’t worry, you’re not alone! Read on for more information about the COVID-19 vaccine doses and boosters available now and who qualifies.

Who can get it?

  • Pfizer-BioNTech: 5 years and older.
    • The COVID-19 vaccine dosage for 5- to 11-year-olds is one-third of the amount given to adults. This is because vaccine dosing is not dependent on weight and size like medications are. Vaccines rely on our immune systems which change as we age.
  • Moderna COVID-19 vaccine: 18 years and older.
  • Johnson and Johnson’s Janssen: 18 years and older.

Learn more about the different types of COVID-19 vaccines.


People with COVID-19, with or without symptoms, should wait to be vaccinated until they have recovered from their illness and/or have met the criteria for discontinuing isolation. This guidance also applies to people who get COVID-19 before getting their second dose of vaccine.

You can get a COVID-19 vaccine and other vaccines, including a flu vaccine, at the same visit.

Why should people who are eligible get vaccinated?

  • Vaccination can help protect you from getting COVID-19.
  • Getting your child vaccinated helps to protect your child and your family.

Currently, the Pfizer-BioNTech COVID-19 vaccine is the only one available to children 5 years and older.

Who can get it?

  • People with moderately- to severely-compromised immune systems should receive an additional dose of mRNA COVID-19 vaccine after the initial two doses.
  • Visit the CDC website for the list of qualifying conditions and ask your primary care provider questions specific to your care.


At least 28 days after a second dose of Pfizer-BioNTech (Comirnaty) or Moderna (Spikevax) COVID-19 vaccine. The Johnson and Johnson (Janssen) vaccine is not part of the third dose recommendation at this time.

Why should people who qualify get vaccinated?

People who are immunocompromised may benefit from a third dose by increasing their protection against COVID-19 because they:

  • Are at a higher risk of getting severely ill from COVID-19
  • May not build the same level of immunity from a 2-dose COVID-19 vaccine compared to people who are not immunocompromised.

Who can get it?

COVID-19 vaccine booster shots are available for the following people six months after their second dose of the Pfizer-BioNTech vaccine:


If eligible, you should get the COVID-19 booster dose six months after your second dose of the Pfizer-BioNTech vaccine. The booster vaccine is not available for the Moderna or Janssen vaccines at this time.

Why should people who are eligible get vaccinated?

Those who get COVID-19 despite vaccination have been shown to experience only mild or moderate health concerns.

Where can I get vaccinated?

There are several places where you can get your COVID-19 vaccination doses:

You do not need written proof of eligibility from your health care provider to be able to get the third mRNA vaccine. We do recommend asking your primary care provider questions specific to your care.

You can find more COVID-19 resources at: