Possible Allergic Reactions to Moderna Vaccine Batch in California

A “higher-than-usual” number of apparent allergic reactions prompted California’s epidemiologist to recommend the state pause administering one batch of Moderna’s COVID-19 vaccine.

Fewer than 10 people required medical attention during a 24-hour time period after receiving doses from a lot by Moderna administered at a community vaccination clinic, State Epidemiologist Erica Pan said Sunday, per The Hill.

The Associated Press reported six San Diego healthcare workers had allergic reactions to vaccines received Jan. 14 at a mass vaccination center. The site now is using other vaccines after being temporarily closed.

More than 330,000 doses from that Moderna lot had been distributed to 287 California providers and arrived Jan. 5-12.

Moderna had not return a request for comment from The Hill.

Pan said an investigation by the state, Moderna, the Centers for Disease Control and Prevention, and the Food and Drug Administration needed to be completed before providers administer more vaccines from the lot.

“Out of an extreme abundance of caution and also recognizing the extremely limited supply of vaccine, we are recommending that providers use other available vaccine inventory and pause the administration of vaccines from Moderna Lot 041L20A until the investigation by the CDC, FDA, Moderna, and the state is complete,” Pan said in a statement.

“We will provide an update as we learn more.”

The risk of a serious adverse reaction is very small, according to Pan. Data from a similar vaccine showed 1 in 100,000 was the rate in which a severe allergic reaction could be expected.

California was dealing with another record outbreak threatening hospital capacity. The state reported 2.97 million coronavirus cases Monday and more than 33,000 coronavirus deaths.

The state had administered more than 1 million coronavirus doses, according to data from the CDC, or 2,716 doses per 100,000 people.

The state last week expanded vaccine eligibility to anyone aged 65 or over.

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