Even if there is a piece of bee in the varroa's gut it would not affect the bees. In fact, you can put a whole bee in the remote, it will not damage the bees if the frequencies you run are for the varroa mite. I think I have a set of freqs for varroa mite.
Unfortunately I wasn't able to locate the varroa mite frequencies in my "books". I will keep looking.
The varroa mites can kill a colony in a matter of a couple of weeks if not treated. Treatment takes place in early Spring and Fall.
Mites, although very little, they are easy to spot. When inspecting a frame of bees, if you see only one mite or two on the whole surface, you may postpone the treatment for a few days but if you see more than two mites then it is time to do something. If left untreated, a few days later you will find an empty hive.
I keep about twenty to twenty five hives and I treat them once between January first to 15th. Since there is no brood this time of the year, all mites are on the bees thus exposed to the insecticide used for treatment. Doing this you may not need to treat them again in the Spring. But if treatment is necessary in the Spring it must be done six times, once every five days. The insecticide can only kill those on the bees. They lay their eggs in the brood cells on the bee larvae so the insecticide cannot kill them until the bee emerges from the cell. That's why we need to do it every five days so to catch all them little bastards.
Varroa mite is a problem but it is easily controllable. There are several kind of mild pesticides you can use. Yes, I know, you don't like to use chemicals but what can we do? There are some plant extracts that can be used, like thymol, oxalic acid and others. The best I have found is a mild pesticide (petroleum based) called Taktik (https://en.wikipedia.org/wiki/Amitraz) which I apply on a small piece of cloth attached to a piece of wire and insert in the hive through the door. There are however other products you can get from places selling hives and such.
Anyway, a few years ago, I lost a few colonies to varroa and now I keep an eye on them all the time. Like I said, they are not hard to control, just look for them and when necessary treat your hives.
Remember, varroa mite is a complex organism and a single frequency may not kill it. However, something I was planning on doing for a few years but never got to it is this: Take two or three bees that have mites on them and place them in a little cage made of window screen mesh (plastic). Then use a plasma rife machine, running frequency sweeps and sit there an watch carefully to see what freq is gonna make them drop.
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