Rome's Spallanzani's hospital is poised to start tests on combining differing types of COVID-19 vaccine, Health Director Francesco Vaia and Lazio Regional Health Chief Alessio D'Amato announced on Tuesday.
The tests will involve 600 volunteers who have had a dose of the AstraZeneca vaccine.
They will be given second doses of the Pfizer or the Moderna or the Sputnik vaccine.
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