A rash quickly spread across her face and torso and her breathing and heart rate became rapid before she was rushed into the emergency room.

Hospital director Lindy Jones said the symptoms in the middle-aged patient eased when she was given a dose of the allergy treatment epinephrine.

Pfizer said the vaccine comes with a clear warning that appropriate medical treatment and supervision should always be readily available in case of anaphylaxis but it would update the labelling language for the vaccine if needed.