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Can you elaborate what is "took forever to get rid of"? My cat had hookworms too as he was a shelter cat. It took 3 rounds of medication to finally cure it (I haven't seen a worm since June 2020). My vet said that's pretty much normal, single dose may not 100% kill all parasites. I live in MA, USA.

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As I understand it, this problem is due to the worm’s lifecycle and rapid generations. The deworming medication is only effective against the worms themselves, not their eggs. Since the worms lay eggs constantly and hatch quickly it takes several treatments to thin out their numbers and cut off the reproductive cycle.

Sure it was multiple rounds of multiple medications trying to find which ones could actually kill the dog track worms he had. It took nearly a year all told.

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