Thatís amazing to kill that many, but to me sounds like this may go on for an eternity. Miss one and it will multiply like crazy. Then it starts all over again throughout the families. Gets old fast. My way of thinking is that you all need to get to the source with some sort of herbal parasite de-wormer in addition to what is being done now. Over on Doc Sutterís forum, they talk like that parasite treatment should go on for months without a break in dosing vs. a few weeks some may recommend. I guess that in countries that have severe infestation problems, they eat foods that keep the critters at bay.
My relative with lyme did a month of doxy, and that didnít get all the critters, is now on strong IV Antibiotics for a minimum of 3 months, then not sure what is after that. Hence my statement above, tho not sure what youíve got.