https://apnews.com/64ddccd70c38a39f880da27941db3540

LONDON (AP) — U.K. regulators have had two reports of possible allergic reactions from people who took part in the first day of Britain's mass coronavirus vaccination program against COVID-19.

Dr. June Raine, head of the U.K.'s medical regulatory agency, reported those reactions as she testified Wednesday to a Parliamentary committee. The U.K. began vaccinating elderly people and medical workers with a vaccine developed by American drugmaker Pfizer and Germany's BioNTech on Tuesday, the world's first rollout of the vaccine.