On protozoa and attack cells [immune]

It was a couple of years ago, when I tried a treatment method through my parasitologist of using anti psychotic drugs.
I did routine microscopic observations [stool]to witness any effects on gut protozoa, which I had since identified, but was unable to see any indications of pathogenicity.
One thing I recorded, was active leukocytes of unknown specificity, attacking these protozoa. The result was a complete oxidation of the microbes, turning them black.
I was very excited to see this, as it meant there was a possibility that the drug acted like a "hapten" allowing deposition of antibodies. In other words, I thought there might be an artificial activation of super attack cells that could wipe out the infection.
Unfortunately this was a short lived response, and I never saw the phenomenon again.
What it means diagnostically, is these protozoa must be unwanted by the body.
That concludes the fact they are at least somewhat pathogenic, definitely parasitic.
It also means, that my immune system IS capable of removing these guys, but is not activating the specialized cells that can get the job done.
There are messenger molecules which can activate those cells, but for some reason, they are not.
Could be that the microbes are blocking these activators, or blocking antigen recognition. Could be a combination of both, and any number of other factors.
Something to contemplate.....................................Shroom
P.S. The below micrograph shows protozoa, depicted in the middle as a small circle. I believe this guy is B. Hominis