Reported last Saturday, six people developed a severe allergic reaction called anaphylaxis after receiving the Covid-19 vaccine made by Pfizer and BioNTech.
The information was released and confirmed by the Center for Disease Control and Prevention (CDC).
The agency said it was investigating the cause of the allergic reactions and what links the six cases might have.
According to the agency, some of the people are from Alaska, but others are from elsewhere, said Tom Clark, a CDC official who submitted data to the Advisory Committee on Immunization Practices, or ACIP, whose members met to vote on another. vaccine manufactured by Moderna.
The affected people are all adults under the age of 65, and most were hospitalized, promptly treated and subjected to observation, said Clark.
Of the 112,807 vaccinated people registered in the health surveillance security system until last Friday, 18, about 3,150 reported symptoms after vaccination that made it impossible for them to perform daily or work activities.
According to Clark, the CDC is deepening the investigations of the reports for more details.
On December 19th, ACIP endorsed the use of the Moderna vaccine in people aged 18 and over, with panelists stating that the benefits of inoculation outweigh the risks, given that thousands of deaths occurred daily in the United States.