California and Colorado start COVID-19 booster shots for all adults

In the other states, only a select group of adults are currently eligible.

A vaccine card showing two doses of Pfizer and a booster.
(Image credit: Shutterstock)

Adults in California and Colorado can receive a COVID-19 booster shot if it has been at least six months since their second dose of the Moderna or Pfizer vaccines, according to the states' public health departments.

This guidance expands the recommendation from the Centers for Disease Control and Prevention (CDC) that only adults who are 65 years or older, or younger adults who are at high-risk of severe disease due to underlying health conditions or who are living or working in high-risk settings, can receive booster doses of Pfizer-BioNTech or Moderna. (The CDC also recommends those who are 18 years of age or older who received Johnson&Johnson at least 2 months ago, to get a booster).

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Yasemin Saplakoglu
Staff Writer

Yasemin is a staff writer at Live Science, covering health, neuroscience and biology. Her work has appeared in Scientific American, Science and the San Jose Mercury News. She has a bachelor's degree in biomedical engineering from the University of Connecticut and a graduate certificate in science communication from the University of California, Santa Cruz.