People get sick, especially in autumn. And they infect each other. Reporting that some people working at the lab were sick, without any knowledge about kind of sickness is only going to add fuel to the conspiracy theories.
What is "sought hospital care"? To get some Vitamin C or get some serious surgery? (In China people go to hospital more often I guess, as people tend to deal with ailments relying on doctors a lot, rather than letting it go by itself.)
Nothing told.