Mine got roundworms once when it got hold of a piece of bacon.

If they are kittens and were strays you should be taking them to a vet for a complete
checkup instead of fooling with over-the-counter stuff.

Good luck.

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Although their preferred place of residence is the intestines, worms can be
ejected from either orifice, especially if it's a larval form.

Worm that cat!

Interesting, but that link is to a Q&A about ringworm,  roundworm, and
tapeworm, hookworm. Doesn't mention any parasite living in the stomache that
can be vomited by the cat.

Sherry

Here's an exchange from this site, for what it's worth:
http://www.thecatsite.com/forums/archive/index.php/t-46277

Rhonda

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dividedsky319
My girlfriend's cat just threw up, and in it was a small moving worm...
the kitten is probably about 3 months old. He always eats a lot and is
somewhat of a fat kitty. He was originally found outside as a barn cat,
we think someone probably dropped him off at the barn. He's an indoor
cat and lives with another kitten, a few months older that we got from
the shelter.

Would it be ok to just go to a pet store and get a de-wormer, or is it
necessary to bring him to the vet? We obviously want him to be in the
best of health, but we don't know how much a visit to the vet would
be... and money is somewhat of an object (although i'd be more than
willing to pay if it's best for the kitten) Also, is it possible for the
other cat to have gotten worms as well since they share a litter box and
food?

Thanks.

Dr. Doolittle
It sounds like your kitty has roundworms. He has probably had them since
he was born. When you say he is "fat" do you mean he has a round belly?
A serious roundworm infestation will make a cat look "potbellied" while
still having little fat covering the ribs and hips. Your kitty probably
has to eat a lot because the worms are eating most of his food!
The vet is the best place to get a dewormer. If he has not had a checkup
yet, it would be a good idea to take him in and he is old enough for
vaccines. Drontal is a great dewormer but a little pricey. Still
probably under $8 for a dose though, and you only need one dose. Stongid
is very cheap and your vet may even give you some for free but it only
kills roundworms and requires a second dose 10 days after the first.
Roundworms are spread through the fecal-oral route. It is very commonly
spread from kitten to kitten and certainly can be spread through a
shared litterbox. A dose of dewormer for your other cat would be a good
idea. Roundworms can also be spread to humans so please be careful when
cleaning the litterbox and wach your hands well afterwards. Be
especially cautious when there are children around.