LONDON, NEW YORK, CHICAGO, Dec 10: Britain’s medicines regulator has advised people with a history of significant allergies not to get the Pfizer-BioNTech COVID-19 vaccine after two people reported adverse reactions on the first day of its rollout in the UK.

LONDON, Dec 8: Britain began the mass-vaccination of its population against COVID-19 on Tuesday, becoming the first Western nation to do so in a global endeavour that poses one of the biggest logistical challenges in peacetime history.