"The major difference between coronaviruses that cause a cold and those that cause a severe illness is that the former primarily infect the upper respiratory tract (the nose and throat), whereas the latter thrive in the lower respiratory tract (the lungs) and can lead to pneumonia. The SARS virus binds to a receptor called ACE2, and MERS binds to one called DPP4—both are found in lung cells, among other places"
https://www.scientificamerican.com/article/how-coronaviruses-cause-infection-from-colds-to-deadly-pneumonia1/
Covid 19 IS a SARS corona. Why are you out there deliberately covering this up and comparing it the flu?