So 3 staff had gotten sick that flu season. Staff who work with infectious diseases and probably get every cough and cold checked out just in case. Seems pretty baseline average to me.
That would be unusual. Given the proximity to the covid19 outbreak, there's a high probability that's the first known cases of covid19 - if confirmed.
People in China routinely go to hospitals for colds. It's cheap, and it makes you feel better, so why not.
Its already incredibly common for average Chinese people to go to a hospital for a cold, and I'd expect someone working in a virology lab would be even more likely to do so.
Yes, but these were three staff who work with infectious diseases and so would not be expected to use hospital resources frivolously. In fact, they would be considered shirkers to do so for a cold. If a doctor at a hospital needs an aspirin he merely takes it - he doesn't check into the hospital, take a bed, etc.
As for the cultural attitudes over doing this in Chinese virology labs, neither of us has any data for it to be any different from the general population. Personally if I had such a job and I was in a country where such a thing was normal I would do it.
Don't forget, for example, social pressure from friends and family.