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When can I introduce new cats to my cats after roundworm treatment?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Male | neutered

We took in a momma cat and 2 babies (3 months old). They were strays living in an abandoned garage. Took them to the vet on Monday and tested positive for roundworm. Vet gave them an oral treatment and then sent us home with Revolution to give in 3 to 4 weeks. We also have 2 indoor cats we have had for 2 years. We have been keeping them all separated. When can we start introducing all these cats without putting our indoor kitties at risk of the roundworm?

1 Answer

Most Helpful Answer

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Answered By Dr. Strydom, DVM

Veterinarian

Published on September 25th, 2019

You should wait 7-10 days before introducing the cats to each other. That way you can monitor them for any upper respiratory signs. I would be most worried about that. After the 7-10 days, if there are no URI signs you can introduce the cats to each other. Use proper technique - see link to an article below - to avoid behavioral problems. The best thing to do is treat all the cats with Revolution in 3-4 weeks just to be safe. It won't hurt them if they don't have roundworms and it will treat them if they do. ( https://www.jacksongalaxy.com/blog/the-dos-and-donts-of-introducing-cats/ )

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