British regulators warned Wednesday that people who have a history of serious allergic reactions shouldn’t receive the new Pfizer-BioNTech vaccine as they investigate two adverse reactions that occurred on the first day of the country’s mass vaccination program.
The UK’s Medical and Healthcare Products Regulatory Agency is looking into whether the reactions were linked to the vaccine. The two people affected were staff members with the National Health Service who had a history of allergies, and both are recovering. Authorities have not specified what their reactions were.
In the meantime, the regulator has issued the warning for anyone who has had a significant allergic reaction to a vaccine, medicine or food. That includes anyone who has been told to carry an adrenaline shot or others who have had potentially fatal allergic reactions.