As of Dec. 18, 3,150 people reported what the agency terms "Health Impact Events" after getting vaccinated.

The definition of the term is: "unable to perform normal daily activities, unable to work, required care from doctor or health care professional."

As The Epoch Times' Zachary Stieber reports, the people reporting the negative effects reported them through V-safe, a smartphone application. The tool uses text messages and web surveys to provide personalized health check-ins and allows users to quickly tell the CDC if they are experiencing side effects.

The CDC and Pfizer, which produces the vaccine with BioNTech, didn't respond to request for comments.

The information was presented by Dr. Thomas Clark, a CDC epidemiologist, to the Advisory Committee on Immunization Practices, an independent panel that provides recommendations to the agency, on Saturday.