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How are they doing now? Do you still need an answer to this? Sorry for the delay.
The good thing about torovirus is that it's generally self limiting. But it can take some time when you're dealing with multiple cats, all of which have contracted it.
Treatment for torovirus mainly just involves giving supportive care.
Here is a great website with a lot more information:
I want you to take a look at it and then let me know if you have more questions.
I'm sorry to hear that you were not pleased. That site is pretty comprehensive and a great reference. The only thing that I would add to is that you can use pedialyte to rehydrate them because they do lose fluids through the diarrhea. You can also boil some chicken and white rice (no bones, no skin) or offer some jarred baby food meat (like gerber). It comes in small, bland chunks.
But, because this is self limiting, you should see it start to resolve within 2 weeks. Some cases do need antibiotics so, if it lasts longer, don't hesitate to see your vet.
I applied Frontline plus on my mail 10 year old cat