Health officials in the United Kingdom have warned those with a history of serious allergic reactions to avoid receiving the Pfizer-BioNTech vaccine.

This comes as country's drug regulator investigates adverse reactions suffered by two health care workers on the first day of vaccinations.

It has been reported both individuals had a history of severe allergies.

Public health officials have said these precautions are common in newer vaccines.

The UK remains the only country in the world to distribute a widely tested and independently reviewed vaccine.

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