Vaccine Types

Vaccine Types

There are currently three vaccines authorized for use in the United States: Pfizer, Moderna  Johnson & Johnson. Both the Pfizer, Moderna vaccines require two shots for full protection. Pfizer vaccine has an interval of 21 days between the doses and Moderna vaccine has an interval of 28 days between the doses.

The Johnson & Johnson vaccine requires one shot. The CDC has updated its recommendations for COVID-19 vaccines with a preference for people to receive an mRNA COVID-19 vaccine (Pfizer-BioNTech and Moderna) over the Johnson & Johnson vaccine. More information here.

Booster Doses and Third Doses
  • Iowans age 12 or older who have been given both doses of the Pfizer-BioNTech COVID-19 vaccine and it’s been at least 5 months, should get a single booster dose.
  • Iowans age 18 or older who have been given both doses of the Moderna COVID-19 vaccine and it’s been at least 5 months, should get a single booster dose.
  • Iowans age 18 or older who have been given one dose of the Janssen/Johnson & Johnson COVID-19 vaccine and it’s been at least 2 months should get a single booster dose.

Mix and Match Use:The Food and Drug Administration (FDA) amended the Emergency Use Authorizations for COVID-19 vaccines to allow for the use of each of the available COVID-19 vaccines as a heterologous (or “mix and match”) booster dose in eligible individuals following completion of primary vaccination with a different available COVID-19 vaccine. CDC’s recommendations now allow for this type of mix and match dosing for booster shots. Mix and match dosing may be considered for the booster dose only.

Third dose: The CDC recommends moderately to severely immunocompromised people receive an additional dose of COVID-19 vaccine. Please review the guidance for who may recieve a third dose here. The third dose should be the same product as the initial 2-dose mRNA COVID-19 primary vaccine series. The third dose recommendation only applies to mRNA COVID-19 vaccines (Moderna and Pfizer), and does not include Johnson & Johnson’s Janssen COVID-19 vaccine.

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