Single dose of Pfizer’s Covid vaccine stops three-quarters of people from spreading disease
26 février 2021According to an article published on the website dailymail.co.uk on 26 février 2021 by ,
Asymptomatic screening of staff at Addenbrooke’s Hospital in Cambridge showed the number of people testing positive fell from 0.8 per cent to 0.2 per cent 12 days after their injection.
