Lab workers getting sick should be a starting point to begin analyzing archived blood samples for instance. Also, you don't usually visit a hospital for seasonal flu. And three people from the same lab at the same time suggests a wider outbreak in the lab. Even if it were the seasonal flu, it would have warranted a wider investigation, given what that lab was working on.
>>GavinM+v
I think lab workers researching viruses are some of the less likely to do so, unless they're in a really bad state. If they were in a very bad state, it's less likely that it was the seasonal flu.
>>corty+(OP)
> you don't usually visit a hospital for seasonal flu
there's numerous posts in previous discussions saying that in China people do, because they don't typically have a GP and so go to the hospital for any acute ailment.