Collective immunity against the coronavirus with the help of vaccines could be built by the end of the year, Velislava Petrova, doctor of immunology at King's College Cambridge, has told bTV. According to her, worries about the side effects of vaccination were not justified, as mortality from the virus was 3-4%, while the vaccine could cause a negative effect in only 3% of people with allergies.

"The important thing is that the vaccine does not contain an active virus, but only a small part of its genome, giving the body information on how to build immunity," she said, adding that the vaccine did not cause immune response.