Two healthcare workers in Britain had an allergic reaction to the Pfizer-Biontech coronavirus vaccine on the first day of its rollout.
Regulators now say people with a history of severe allergies should not take the jab.
The two patients had mild allergic reactions and both recovered fully.
Dr June Raine from the MHRA regulator says data from the vaccine will be constantly monitored and acted upon as it's rolled out.
IN: "We know...
OUT: ...immediately."
DUR: 19 seconds