“In the concept of herd immunity, we mean not only acquired immunity, but also specific immunity - that immunity that is determined by the production of interferons,” he said.

According to him, in the summer this immunity really increases due to the sun and vitamins.

"In the fall, this adaptable herd immunity, unfortunately, drops sharply and we can only hope for a vaccine," TASS quotes the virologist.

Earlier, the World Health Organization (WHO) reported that the number of detected cases of coronavirus infection COVID-19 in the world exceeded 18 million.

On August 4, Rospotrebnadzor spoke about the progress of testing a vaccine against coronavirus infection COVID-19 of the State Scientific Center of Virology and Biotechnology "Vector".

At the end of June, Doctor of Biological Sciences Alexei Agranovsky, in an interview with URA.RU, assessed the likelihood of a second wave of COVID-19.