Covid-19 is a strain of a coronavirus which represents group of viruses which usually cause slight diseases, such as cold. Covid-19 is a new strain of a coronavirus which was for the first time identified in December, 2019 to the Provinces of Hubei, China.

It strongly differs and is much more serious than the seasonal outbreaks of flu which happen every year for several reasons. First, the period of manifestation of symptoms at people can last up to 14 days, but not two days as it occurs at flu. It means that people can extend a virus within two weeks, without knowing about it.

Besides, the coronavirus easily extends when people expectorate the small droplets filled with a virus which then other people through a mouth, a nose or eyes catch. At last, the death rate from Covid-19 is 1-3 percent, that is is much higher, than from flu that gives it potentiality to win over health care systems.