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University Library, University of Illinois at Urbana-Champaign

COVID-19 Vaccines

Information and evidence about COVID-19 vaccine efficacy and safety

New Variants

What We Are Still Learning

We are still learning how effective the vaccines are against new variants of the virus that causes COVID-19.

Early data show the vaccines may work against some variants but could be less effective against others. We are learning more each day about the characteristics of new variants. CDC will share updates as soon as they are available. Learn more about COVID-19 vaccines and new variants of the virus.

SOURCE: CDC - (April 15, 2021)