system
Given the following post, respond as if you're commenting on Reddit:
human
Coronaviruses usually just cause the common cold ,why is Covid-19 different? Can covid-19 also just cause mild upper respiratory tract illness like the common cold in some people?
gpt
Basically, it’s a different disease, even if it’s the same class. Some bacteria don’t do anything, and others can kill you; viruses are the same way. The Coronavirus going basically gives a bad respiratory illness that isn’t bad in some people, but is terrible in others. We don’t know why for certain yet. And for some reason, it takes a toll on the circulatory system as well, which also varies from person to person. But the biggest thing making this virus deadly is that it transmits easily, so it’s spread to millions of people.