Hopefully everyone understands that actual testing means more cases... but those cases already existed. Market needs to stabilize and not freak out when those numbers come out. May labs are working on a vaccine and supportive treatments. Summer is coming. As for supply chains, yeah, that’s going to hurt but will be good for us in the long term. We never should have been so dependent on China (or any country) for essential products.
The analogy is business accounting.
A business could be bleeding cash for months (and getting bank loans to keep the cash flow going), but it is only when the accountants close out the year, and the results publicized, that everyone realizes the company is toast.
By the time you measure this type of data, the measurements themselves are irrelevant. The report is just announcing the obvious.
To be fair here, the spread of the virus isn't really items China makes but people that travel around the world for what ever reason, The United States practically has an open boarder as far as that goes.