I think "sought hospital care" is the key phrase. If a few people from that lab got sick AND ended up in the hospital... considering this is supposed to be very infectious, then why is that line so hard to draw?
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.
Anyway assuming it's at least not a lie, "sought hospital care" would mean it's not just a trivial cold. Again, I'll be waiting for more details, I just think Occam's razor is converging here, and there are more hurdles to dance around with the other explanations.