@MechaSilvio @Spingebill @DEERBLOOD @nike @sickburnbro Iirc any antiparasitic with black walnut and wormwood is supposed to be effective.
And I think you are supposed to start deworming a few days to a week before a full moon (apparently parasites breed on a lunar cycle, and farmers usually deworm around that time).
And go through the same deworming process the following month to get all the wormies.