Allergic reactions lead Calif. to pause using single batch of Moderna vaccine

The move, made “out of an extreme abundance of caution,” means that 330,000 doses distributed to 287 providers across the state can’t be used amid an already slow vaccine rollout.

“A higher-than-usual number of possible allergic reactions were reported with a specific lot of Moderna vaccine administered at one community vaccination clinic,” California State Epidemiologist Dr. Erica Pan said.

Officials said fewer than 10 people needed medical attention over the span of 24 hours, but didn’t clarify what their allergic reactions were.

“All appeared to be experiencing a possible severe allergic reaction during the standard observation period “a type of adverse event that the CDC reports some people have experienced when receiving a COVID-19 vaccine,” state health officials said in a news release.

The reactions are under investigation.

Meanwhile, providers were told to use doses from other available vaccine inventory until the investigation is complete. The pause applies only to one lot that came from Moderna, and not all the vaccine doses from the company.

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Alex Tavlian
Alex Tavlian is the Executive Editor of The San Joaquin Valley Sun and Executive Director of Valley Future Foundation. You can reach Alex at