What I've read is that in these clumps of virus outbreaks, doctors have tried a variety of treatments, some have been effective, and some have not.
The problem is, given this administration and their incompetence, is that this information is not being shared. Doctors in Washington may have figured out the most effective methods of treatment, but when cases start erupting in New York, doctors there are starting treatments at zero baseline, running through all the same protocols that the doctors in Washington had tried, and didn't work, until they stumble upon the same ones that did.
All this because the Trump administration is trying to downplay this whole thing, and leave it to the state and local authorities, instead of leading at the federal level.
I would think the more information medical people have, the more cases registered and known about, where those people are and where they've been, the more effective their strategies in fighting it will be.