Hey,
I have to confess I am less 'up' on nematodes than I am fluke. For fluke you're right. I think it was in the Netherlands, they had resistance to triclabendazole (active ingredient of Fasinex) on a farm. 3 years later, after using alternative active ingredients to control fluke, the resistance was still there.
I had thought there was some reversion possible in GINs (gastrointestinal nematodes) with some active ingredients but not sure if I misunderstood now. Will check and report back :-)
And no idea about spellcheck. My chrome browser does it for me.
Dans