The Centres for Disease Control and Prevention (CDC) in the United States (US) on Saturday (December 19) said that it was monitoring reports of allergic reactions to the COVID-19 vaccination and made recommendations on how people with histories of allergies should proceed.
Anyone who had a severe reaction to a COVID-19 vaccine should not get the second dose, the agency said. It defined 'severe' as a reaction requiring the medication epinephrine or treatment in a hospital.
People who have had a severe allergic reaction to any ingredient in a COVID-19 vaccine should avoid the vaccine formulation containing the ingredient, the CDC said.
Individuals with histories of a severe allergic reaction to vaccines should consult their doctors about the COVID-19 shot, it advised.
The CDC said people with severe allergies to food, pets, latex or environmental conditions as well as people with allergies to oral medication or a family history of severe allergic reactions could still get vaccinated.
The CDC is a federal agency under the Department of Health and Human Services in the US, with a mission to promote and protect the public health of its citizens.
The U.S. Food and Drug Administration (FDA) is investigating around five allergic reactions that happened after people were administered Pfizer Inc and BioNTech SE's COVID-19 vaccine in the United States in the previous week.
On Friday, the FDA said that the Moderna Inc vaccine, which received emergency use authorization, should not be given to individuals with a known history of a severe allergic reaction to any components of the shot.
Two vaccines have been approved in the United States under emergency use authorisations. The FDA had first approved Pfizer Inc and BioNTech SE's COVID-19 vaccine earlier this month. Recently, it also approved Moderna's vaccine for emergency use too.
Britain's medical regulator has also said that anyone with a history of anaphylaxis, or severe allergic reactions to medicine or food, should not be given the Pfizer-BioNTech COVID-19 vaccine.