An individual infected with COVID-19 can infect others and transmit the virus three or four days prior to any symptoms appearing, as about 200 viral particles are released into the air with one exhalation.

The transmission period of COVID-19 peaks two days before symptoms appear and on the first day of symptoms appearing as well.

According to the Deputy Director of the Epidemiological Center at the Federal Service for Surveillance on Consumer Rights and Human Wellbeing (Rospotrebnadzor); the Russian Professor, Natalia Pshenichnaya, a person infected with COVID-19, can be considered a source of infection five days, or sometimes seven days before the first symptoms appear.

It was indicated that the ability to transmit the infection begins to diminish two days after symptoms of COVID-19 appear with transmission abilities disappearing completely afterwards.