I think in terms of flat, red, white.
Yea its a fluke, but the estimate is there are some 2 million species, only like a dozen families, and even fewer meds that work.
Even with so few meds, it is usually complications from other families, or enzyme message disruptions, like MUC or excess zinc, or unbalanced human that makes them hard to remove.
My experience and communications using LEV and Prazi, ALB, DEC, IVM, sometimes Fenben at same MIDI sequence, has gotten every, or nearly every one.
TCBZ, or asian fluke meds depend on that exposure, where another med is a better choice.
Most hard to kill fluke infections, that do not resolve with time, from people I know that tried other formulas, come back to Prazi, one of 2 larvacide meds.
Punching holes in a family of parasites, like flat worms, is a great way to kill them, when your body and mix are right.
Some have bad flatworm infections, one gal I communicated with took a year to clear the problem, every kind under the sun, came out.
Like peeling an onion, remove one to find another species underneath, is common, especially with flatworms.
Cream or white flukes of that size indicate an infection that has existed for a long time.
Bile salt and liver supplements, exact choline dose, etc will be required to get body and liver healthy enough to survive the kill.