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Covid-19 vaccine: Everything you need to know

Dec 8, 2021
2 min read


There are four types of vaccines in clinical trials: whole virus, protein subunit, viral vector and nucleic acid (RNA and DNA), each of which protects people, but by producing immunity in a slightly different way.






Different COVID-19 Vaccines

All currently approved or authorized COVID-19 vaccines are safe and effective and reduce your risk of severe illness. CDC does not recommend one vaccine over another.

Pfizer-BioNTech [ 1 ]

Moderna[ 1 ]

Johnson & Johnson’s Janssen[ 1 ]

Ages Recommended

5+ years old

Ages Recommended

18+ years old

Ages Recommended

18+ years old

Primary Series

2 doses

Given 3 weeks (21 days) apart [ 2 ]

Primary Series

2 doses

Given 4 weeks (28 days) apart [ 2 ]

Primary Series

1 dose

Booster Dose

Everyone ages 18 years and older is eligible at least 6 months after the last dose in their primary series. Any of the three COVID-19 vaccines can be used for the booster dose.

Booster Dose

Everyone ages 18 years and older is eligible at least 6 months after the last dose in their primary series. Any of the three COVID-19 vaccines can be used for the booster dose.

Booster Dose

At least 2 months after the first dose for all people ages 18 years and older. Any of the three COVID-19 vaccines can be used for the booster dose.

When Fully Vaccinated

2 weeks after 2nd dose

When Fully Vaccinated

2 weeks after 2nd dose

When Fully Vaccinated

2 weeks after 1st dose



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