The healthcare worker with the Mount Sinai system has been treated and is in stable condition.
The reaction has been reported to the CDC, which will likely publish a case report.
This is the only report of a severe side effect so far in New York.
More than 30,000 COVID-19 vaccinations have been administered in New York City since Wednesday morning.
The city said in a statement: “Vaccines have side effects and allergic reactions are known to occur – although they are less common. We also know that based on clinical trials and reports of side effects in other jurisdictions, such reactions are rare, but have been reported with the Pfizer vaccine. The city’s Department of Health is closely following reports of more severe side effects in collaboration with the CDC, and this is the first serious adverse event we have encountered in New York City. We will continue to continue with the distribution of the coronavirus vaccine to ensure that health care workers and nursing staff and residents are protected against COVID-19. “
On Tuesday, the city launched a campaign to increase confidence in the vaccine and worked to convince not only first responders, but all New Yorkers, that vaccines are safe and effective.
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