TF is very hard on kittens- it can dehydrate them, cause them not to thrive and gain weight. I had a whole litter hit with it years ago. I was a breeder's nightmare but fortunately, I only had a few adult cats and the litter of kittens. I had to get the meds compounded but dosed accurately, they recovered in 3 days from symptoms which to me was heaven. They treatment had to be longer but at least the kittens were gaining and not having the squirts constantly!!! TF is not a natural parasite in cats but effects and lives in the colon. It causes fiercely strong smelling diarrhea. The meds effect the liver but the liver is very renewable organ. My kittens recovered and I did not have it again but I did treated every cat in my household.
Unlike giardia which is very resilient to drying and cleaning, Tri Trick f. does not survive well outside the body and can be eliminated with careful and constant cleaning. I think some cats can be carriers. I spayed and placed the mother as a pet as I was highly suspicious that she was a chronic carrier.
Yes, a breeder can elimate it but it takes some effort and knowhow.
When my kittens got it, little was known. Even my vet had not heard of it in cats and the test we had to run was extremely delicate, had to be stored correctly, cultured for 14 days, and was actually for cows! It is nice that PCRs can test for it now although they are much more expensive, at least they are accurate.