I was under the impression that ivermectin wouldn't affect a protozoa.

And even if it did, it wouldnt pass the blood brain barrier so it would be useless here.

[I am not a doctor and dont know what im talking]

Per this article protozoa could be affected:

https://pubmed.ncbi.nlm.nih.gov/8918027/

One would have to administer it in early stages before it passes BBB. Pity it got such a bad rap because Zapp Brannigan mentioned it (despite winning a Nobel Prize).