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It is safe for people who experienced an allergic reaction to the first dose of a COVID-19 vaccine to receive the second dose, a new study suggests.
Researchers from Massachusetts General Hospital (MGH) looked into hospital data from people who reported allergic reactions to the first shot of either Pfizer or Moderna.
They found that only a third of patients had an allergic reaction to the second dose after having one to the first, and the reactions were relatively minor.
The findings add to the growing knowledge about the vaccines, and their potential effects on people over time.
Receiving a second dose of the COVID-19 vaccine is particularly important as well, as some research shows only one dose of a vaccine may not be effective against the Indian 'Delta' variant.
Researchers found that people who developed an allergic reaction to the first dose of a COVID-19 vaccine are safe to receive the second dose
For the study, published in JAMA Internal Medicine, the team investigated data from patients who went to an allergy specialist after receiving their first dose for a potentially life-threatening whole-body allergic reaction.
Around 2.5 out of every 10,000 people, or 0.025 percent, will