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