Story at a glance

  • Several reports of allergic reactions coming from San Diego have prompted officials to halt vaccination from a particular batch of Moderna vaccine.
  • During clinical trials, roughly 1 in 100,000 patients saw an adverse allergic reaction.

Following a report from California’s department of health, pharmaceutical company Moderna said it is investigating reports of allergic reactions among patients receiving its vaccine. 

Reuters reports that several people experienced possible allergic reactions while being vaccinated at a San Diego vaccine center. State officials preceded the company’s announcement by recommending health care providers halt vaccination from this specific batch, delegated as no. 41L20A, as authorities investigate possible adverse reactions.

Officials confirmed on Jan. 17 a higher number of allergic reactions were seen from this specific vaccine batch.

"Our goal is to provide the COVID vaccine safely, swiftly and equitably," said Erica Pan, a state epidemiologist. 


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"A higher-than-usual number of possible allergic reactions were reported with a specific lot of Moderna vaccine administered at one community vaccination clinic. Fewer than 10 individuals required medical attention over the span of 24 hours.”

Emphasizing the low probability of these outcomes, similar anaphylactic episodes among recipients of Moderna’s COVID-19 vaccine are rare, occurring at a rate of about 1 in 100,000 shots administered.

Of this batch of vaccines, more than 330,000 doses have been administered to 287 providers in California. Only the San Diego vaccine center has reported adverse reactions among patients.

“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 continued. “We will provide an update as we learn more."

Some 307,300 vaccine doses from this batch are still in storage. And 1,272,200 doses in total were produced in the lot under investigation. 


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Published on Jan 19, 2021