Different COVID-19 Vaccines

Different COVID-19 Vaccines

FDA has granted emergency use authorization for the Johnson & Johnson/Janssen COVID-19 Vaccine.

Authorized and Recommended Vaccines

As COVID-19 vaccines are authorized and then recommended for use in the United States, it will be important to understand what is known about each vaccine. CDC will provide information on who is and is not recommended to receive each vaccine and what to expect after vaccination, as well as ingredients, safety, and effectiveness.

Currently, three vaccines are authorized and recommended to prevent COVID-19:

Vaccine Types

This web page explains how the body fights infection and how COVID-19 vaccines protect people by producing immunity. It also describes the different types of COVID-19 vaccines that currently are available or are undergoing large-scale (Phase 3) clinical trials in the United States.​

Understanding COVID-19 mRNA Vaccines
This web page provides information about mRNA vaccines generally and about COVID-19 vaccines that use this new technology specifically.

This web page provides information about viral vector vaccines generally and about COVID-19 vaccines that use this new technology specifically.

Vaccines in Phase 3 Clinical Trials

As of December 28, 2020, large-scale (Phase 3) clinical trials are in progress or being planned for two COVID-19 vaccines in the United States:

  • AstraZeneca COVID-19 vaccine
  • Novavax COVID-19 vaccine​

Learn more about U.S. COVID-19 vaccine clinical trials, including vaccines in earlier stages of development, by visiting clinicaltrials.govexternal icon.

This page will be updated as additional information is available.