I would be very careful about worming them with such a high worm load. If too many die off at once, you could have an impaction colic on your hands. Ideally, you would get a fresh fecal sample and have your vet test it to see what to worm for as you could worm all day long and have nothing wrong because you would be worming for the wrong worms. But that's prettymuch impossible in your situation.
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