I'm a retired programmer who does ride sharing in Silicon Valley. I often pick up people at the San Jose airport. Sometimes they are coming in from China or Seattle. I live in a Chinese neighborhood. I gave a woman who couldn't breath a ride to the emergency room. When I got sick in February, I figured it was the flu, but now realize it was probably Covid-19 based on symptoms. I recovered nicely and have been quarantining myself just in case.
It's like the flu with the added difference that it makes breathing more difficult. Also difficulty swallowing. It was more annoying than anything, not really that bad. I don't have any health problems, but if I did have breathing issues, I imagine it might be very problematic.