Not sure what happened?!?!?

I had posted a few days back about a couple of my girls (who are not together and have no contact) suddenly coming down with frothy eyes and the one had what seemed to be some crusty nasal discharge.. also seemed a bit lethargic.. still eating and drinking but just not normal.. anyway after 2 days of vet rx and one day of sulmet mixed in water both are miraculoulsy better!!! eyes clear, no nasal discharge and back acting normal.. or at least as normal as one can be in mid upper 90s with very high humidity!!! anyway not sure what happened or what actually worked but they are better and that is all that matters and no signs of issues with anyone else.. stumper that worked out good.