Find out when you need another dose of the COVID-19 vaccine

Last updated on June 28, 2022.

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Find out how many doses you or your child will need with our COVID-19 vaccine follow-up dose calculator.
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COVID-19 vaccines work well to protect people from getting seriously ill, being hospitalized, and even dying. Immunity from vaccines can drop over time. Staying up to date with all recommended doses is the best way to keep up protection for you, your loved ones, and the community. 

Everyone aged 6 months and older should get at least two doses of the COVID-19 vaccine. Most people need three doses for the highest level of protection. Some people may need to get four or five doses depending on their age and medical conditions.

COVID-19 vaccines are safe, effective, and free. You don’t need an ID or insurance to get a vaccine. Find a follow-up dose near you.

 

How many doses do I need?

The number and timing of your doses depends on your age, which vaccine you first received, and whether or not you are immunocompromised.

You’ll need at least three doses for the highest level of protection.

Talk with your/your child’s health care provider about when to schedule your second dose.
  • Some people should get their second dose three weeks after their first. This is the recommended schedule for people who are moderately to severely immunocompromised, adults ages 65 years and older, people who may be at high risk of getting very sick from COVID-19, and others who need protection quickly.

  • Some people may get their second dose up to eight weeks (two months) after their first. Waiting up to eight weeks between doses may reduce your risk of a rare side effect called myocarditis, a type of heart inflammation. This second dose timing may be best for men and boys aged 12 to 39, who are at higher risk of myocarditis compared to other people.

  • You should receive the same type of vaccine for your second dose that you received for your first dose.

The timing of your third dose depends on your age and whether or not you are immunocompromised. 
  • Children aged 6 months through 4 years should get their third dose at least eight weeks after their second dose. This dose is part of the primary vaccine series.

  • People aged 5 years and older who are not immunocompromised should get their third dose at least five months after the second dose. This is also called a booster dose. Adults aged 18 and older can get either Pfizer or Moderna for their third dose. Children aged 5 to 17 years can only get Pfizer. 

  • People aged 5 years and older who are moderately to severely immunocompromised should get their third dose at least four weeks after the second dose. This dose is known as an additional dose and is part of your primary vaccine series. It should be the same type of vaccine as your first two doses.

Some people should receive a fourth dose.
  • If you are moderately to severely immunocompromised and aged 5 years or older, you’ll need to get a fourth dose at least three months after your third dose. This is also called a booster dose.

  • If you are not immunocompromised, but you are aged 50 years or older, you should receive a fourth dose (second booster) at least four months after your third dose (first booster).

Some people should receive a fifth dose as well.
  • If you are moderately to severely immunocompromised and aged 12 years or older, you should get a fifth dose (second booster) at least four months after your fourth dose (first booster). 

  • Adults aged 18 and older can get either Pfizer or Moderna for their fourth and fifth doses. Children aged 12 to 17 years can only get Pfizer.

You’ll need at least two doses for the highest level of protection.
  • Children aged 6 months through 17 years who are not immunocompromised need two doses of the Moderna vaccine. 

  • Children aged 6 months through 17 years who are immunocompromised need three doses of the Moderna vaccine.

  • All adults aged 18 years and older need at least three doses.

Talk with your/your child’s health care provider about the best time to schedule the second dose.
  • Some people should get their second dose four weeks after their first. This is the recommended schedule for people who are moderately to severely immunocompromised, adults ages 65 years and older, people who may be at high risk of getting very sick from COVID-19, and others who need protection quickly.

  • Some people may get their second dose up to eight weeks (two months) after their first. Waiting up to eight weeks between doses may reduce your risk of a rare side effect called myocarditis, a type of heart inflammation. This second dose timing may be best for men and boys aged 12 to 39 years, who are at higher risk of myocarditis compared to other people.

The timing of your third dose depends on whether or not you are immunocompromised. 
  • If you are aged 18 years or older and are not immunocompromised, you should get a third dose at least five months after your second dose. This dose can be either Pfizer or Moderna. This is also called a booster dose. 

  • If you are moderately to severely immunocompromised, you should get your third dose of Moderna at least four weeks after your second dose. This dose is known as an additional dose and is part of your primary vaccine series.

Some adults should receive a fourth dose.
  • If you are moderately to severely immunocompromised and aged 18 years or older, you’ll need to get a fourth dose three months after your third dose. This dose can be either Pfizer or Moderna. This is also called a booster dose.

  • If you are not immunocompromised, but you are aged 50 years or older, you should receive a fourth dose (second booster) at least four months after your third dose (first booster). This dose can be either Pfizer or Moderna. 

Some adults should receive a fifth dose as well.
  • If you are moderately to severely immunocompromised and aged 18 years or older, you should get a fifth dose (second booster) four months after your fourth dose (first booster). This dose can be either Pfizer or Moderna. 
You’ll need at least two doses of COVID-19 vaccine for the highest level of protection. The timing of your second dose depends on whether or not you are immunocompromised.
  • If you are not immunocompromised, you should get a second dose of either Pfizer or Moderna at least two months after your first dose of Johnson & Johnson. This is also known as a booster dose.
    • People who can’t get Pfizer or Moderna for medical or accessibility reasons can get Johnson & Johnson for their second dose.
  • If you are moderately to severely immunocompromised, you should get a second dose of either Pfizer or Moderna at least four weeks after your first dose of Johnson & Johnson. This is also known as an additional primary dose.
Some people will need a third dose after starting with the Johnson & Johnson vaccine.
  • If you are moderately to severely immunocompromised, you should get a third dose of Pfizer or Moderna at least two months after your second dose. This is also known as a booster dose.

  • If you are aged 50 years or older and not immunocompromised, you should get a third dose (second booster) of either Pfizer or Moderna at least four months after your second dose (first booster). It doesn’t matter which type of vaccine you received for your second dose if you are in this age group.

Some people may receive a third dose after starting with the Johnson & Johnson vaccine.
  • If you got Johnson & Johnson for both your first and second doses, you may get a third dose (second booster) of either Pfizer or Moderna at least four months after your second dose (first booster). 

  • People who may benefit most from a third dose in this situation are people who are at higher risk because of their age, medical conditions, or living or working situations. These risk factors make it more likely that you will get very sick or need to be hospitalized from COVID-19. Talking with a health care provider can help you learn more about whether it’s best for you to get a third dose, but it’s not required.

Some people will need a fourth dose after starting with the J&J vaccine.
  • If you are moderately to severely immunocompromised, you should receive a fourth dose (second booster) four months after your third dose (first booster). 

If you’re due for another dose, schedule an appointment to get one. We encourage you to talk with a health care provider if you have questions, but it’s not required.

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Why do I need another dose if I am already fully vaccinated?
  • Staying up to date with your COVID-19 vaccines gives you the highest level of protection from severe illness, hospitalization, and death.
  • Our immune systems remember what they have fought in the past. Vaccines let our immune systems practice fighting pieces of the COVID-19 virus. Follow-up doses remind the immune system what COVID-19 looks like and how to fight it. With more practice, the body makes more and better antibodies to fight COVID-19.

 

Is it safe to get another doses?

Data from CDC shows that getting the recommended number of doses is safe. The side effects are about the same as the side effects of the primary vaccine doses.

 

Where can I get a follow-up dose?

You can get a follow-up dose at any vaccine provider. No ID, insurance, or proof of medical history is required. All doses of the vaccine are free.

 

What does it mean to have a moderately to severely weakened immune system?
  • This includes but is not limited to people who have: 

    • Been receiving active cancer treatment for tumors or cancers of the blood. 

    • Received an organ transplant and are taking medicine to suppress the immune system.

    • Received a stem cell transplant within the last two years or are taking medicine to suppress the immune system. 

    • Moderate or severe primary immunodeficiency (such as DiGeorge syndrome, Wiskott-Aldrich syndrome). 

    • Advanced or untreated HIV infection. 

    • Active treatment with high-dose corticosteroids or other drugs that may suppress your immune response.

  • Talking with a health care provider about your medical condition can help you learn more about whether getting an additional dose makes sense for you. However, it’s not required to have a conversation with a provider before getting an additional dose.

  • Coloradans looking to get an additional dose may self-attest that they are eligible. You do not need to provide your medical history to receive an additional dose.

 

Am I still considered fully vaccinated if I’ve only received two doses of Pfizer or Moderna or one dose of Johnson & Johnson?
  • Yes. Right now, CDC’s definition of “fully vaccinated” is still the same. If an event or venue is checking your vaccination status, you are considered fully vaccinated if more than two weeks have passed since you completed your primary vaccine series

  • We strongly recommend getting all recommended doses for the highest level of protection.

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For more information on the COVID-19 vaccine, please call:

1-877-CO VAX CO (1-877-268-2926)
Available Monday through Friday, 8 a.m. to 8 p.m.;
Saturday and Sunday, 9 a.m. to 6 p.m. MT.
Answers available in multiple languages.

The call center will be closed on Nov. 25, Dec. 25, and Jan. 1 for the holidays.