A 23-year-old Italian woman is under observation in a hospital in Italy after receiving six doses of the Pfizer vaccine in error.

The woman in Tuscany was in good condition after receiving fluids and paracetamol following the injection yesterday, the AGI news agency reported.

Instead of injecting just one dose into the arm of the student, a nurse mistakenly injected the entire vial, the equivalent of six doses.

Previous studies to test overdoses of the Pfizer vaccine were limited to four doses, AGI wrote.

The incident has been reported to Italy's medicine regulator.

Overdoses of the Pfizer vaccine have previously been reported in the United States, Australia, Germany and Israel.