The disease may suddenly change, and this is the insidiousness of coronavirus, said the head of the Russian Ministry of health Michael Murashko.

"This virus is insidious, and sometimes the disease suddenly changes its course. In the background, like improvement and good enough devolution symptoms suddenly there is a new wave. Here it is important not to miss the changing condition of the patient," he said in the TV channel "Russia-1".

At the same time, he noted that the restrictive measures because of the coronavirus has affected the structure of morbidity in Russia, people become more cautious, and it helps the health care system.