WHAT EXACTLY HAPPENED?UK officials said there have been two reports of anaphylaxis and one report of a possible allergic reaction since rollout began.
Anaphylaxis can cause throat swelling, breathing trouble and difficulty swallowing, according to the American Academy of Allergy, Asthma & Immunology.
Anaphylaxis is an overreaction of the body's immune system, which the UK National Health Service describes as severe and sometimes life-threatening.Also read: The pandemic push to the silver economyWHO SHOULD NOT GET THE VACCINE, ACCORDING TO UK REGULATORS?British regulators initially responded by saying anyone with a history of a significant allergic reaction to a vaccine, medicine or food should not take the shot.