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Hello, I'm Dr. Deb and will do my best to help you with this concern about Diesel.
Certainly round worms would be the most common internal parasite which a young kitten might have picked up and when vomited, tend to look like spaghetti or possibly long strings (although they should be thicker than string). If this is the problem, then there are otc worm medication which you can purchase at just about any pet or grain store. Paomate Pyrantel is the active ingredient and is sold under names such as Strongid, Nemex and Evict as well as others.
The dosage amount is indicated on the label; I recommend every two week for three doses. This is a safe medication so even if she doesn't have round worms, it won't be harmful.
You might see looser stools for a few days after he's given this medication but this is normal and shouldn't be worrisome.
I hope this helps, Deb
I'm just following up on Diesel. How are things going with him? Deb