Nothing wrong with Rx if it works and if it doesn't do more damage then good. At one point I thought this was a case of schistomiasis and there is a simple and effective cure for it (Praziquantel) which so far proved to be incredibly safe, so I was ready to take it. However, it is not schistosomiasis, so taking it would be a waste.
Interestingly enough, microsporidians are seemingly responsible for bee population decimation, ("Colony collapse disorder") and we may be able to learn something about microsporidians and how to get rid of them from bee examples. Bees don't seem to have any natural and effective response to them, but scientists do, so researching a bit may produce some interesting results. One of them uses a medication which is a product of certain type of fungus. Now, keeping in mind that a good portion of DNA in microsporidians is of fungus type, and knowing that the best way to get rid of a fungus is to introduce another fungus, that type of medication might just do the trick. However, anything that comes from fungus is often highly toxic so we need to be careful.