Researchers analyzed the results of thousands of Covid-19 tests, which are conducted weekly as part of hospital examinations of medical teams in Cambridge, east England.
A third dose Earlier, scientists at the American company Pfizer and its German partner Biontech confirmed that they are examining the option of giving people a third dose of their vaccine.
And Pfizer stated, on Thursday, that the matter comes as part of its new strategy to protect humans from new strains of the Corona virus.
The health authorities say that the first generation of Corona virus vaccines is still effective against new versions of the epidemic, including the British and South African strains.
But manufacturers have begun to prepare for genetic mutations in the epidemic that are more resistant to vaccines.
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