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California health officials are asking vaccine suppliers to stop administering a batch of Moderna’s Covid-19 vaccine, after an unusually high number of adverse reactions have been linked to the drug.
Doses of Moderna Lot 041L20A are suspected of causing “Higher number of adverse events than usual” and should be shelved until a proper investigation can be conducted, the California Department of Public Health said on Sunday.
State epidemiologist Dr Erica S. Pan said in a statement that “Less than 10 people” suffered “A possible serious allergic reaction” and required medical attention within the last 24 hours after injection of the specific lot of vaccine. All of the incidents appear to have occurred at a single community clinic that administered the batch. The site reportedly closed for several hours after the series of side effects, before moving on to another batch of the drug.
“Out of extreme caution and also recognizing the extremely limited vaccine supply, we recommend that providers use other available vaccine stocks” said the health official.
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More than 330,000 doses of the same batch of Moderna vaccine have been distributed to 287 vendors across the state, but this is the first time that health officials have received reports detailing adverse reactions associated with the batch, according to Pan.
While recognizing that “There is less data on the side effects associated with the Moderna vaccine”, the state epidemiologist said it was rare for vaccines to trigger serious side effects.
Moderna, the Centers for Disease Control and Prevention (CDC), and the U.S. Food and Drug Administration (FDA) are reviewing the batch and all relevant medical data.
The Covid-19 coup has been linked to other cases of serious medical emergencies. In December, a Boston doctor said he suffered one of the worst allergic reactions he had ever experienced after receiving Moderna’s vaccine, describing the episode as potentially fatal.
Similar cases related to the Pfizer / BioNTech vaccine have been referred to the CDC and the FDA for review.
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