Think of it this way. If it's new information about the virus itself, like an announcement of a vaccine or such, or data about the actual spread, then it belongs in the thread. A good guideline is to consider the Wuhan Virus thread to be a clearinghouse for actual *virus* information. Things that are simply related to it? Different threads.
Protests about the lockdown? There's a thread for that. Conspiracy theories about it? There's a thread for that too. People being idiots? Guess what? Bashing on China over it? There's a thread for that too.
Ideally, if a new post shows up in that thread, it should be actual information about the virus itself. So when people see it, they know it's information about the virus and not something peripherally related to it.