“Most of the people who get infected during the fourth wave of Covid-19 will probably be unvaccinated young people because the older people are now vaccinated,” Prof. Soren Hayrabedyan, immunologist at the Bulgarian Academy of Sciences’ Institute of..
During the outgoing week British researchers warned that there are more than 4,000 different SARS-CoV-2 strains circulating in the world, and the UK variant, which is much more contagious, is now spreading in Bulgaria. Commenting on the virus..
