U.S. begins study assessing allergic reactions to Pfizer and Moderna Covid vaccines

The NIH said it has begun looking at why some people have suffered from allergic reactions after receiving the Pfizer-BioNTech and Moderna Covid-19 vaccines. The NIH study will enroll 3,400 adults ages 18 to 69 at up to 35 academic allergy-research centers nationwide. Most of the rare, severe allergic reactions to these vaccines have occurred in people with a history of allergies, public health officials have said.