A U.S. health agency is looking for volunteers for a study of allergic reactions to the two COVID-19 vaccines built on messenger RNA (mRNA) technology, though several people who experienced reactions say interested people should not enroll. The National Institute of Allergy and Infectious Diseases (NIAID), an office within the National Institutes of Health (NIH), started the trial last year but is having trouble enrolling enough people. According to the trial’s official record, investigators started recruiting in July 2021 and the first patient received a vaccine on Sept. 8, 2021. Participants must have experienced mild or moderate allergic reaction to the Pfizer or Moderna COVID-19 vaccines, both of which are based on the mRNA platform. During the study, each person will get a dose and be monitored for another reaction. Only 13 people have volunteered so far, Dr. Pamela Guerrerio, the study’s principal investigator, told The Epoch Times in an …