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You can treat it with a pill from your vet. Drontal plus or droncit works well for tapeworms. Most vets will dispense it if you just describe the worm over the phone.
So - go ahead and give the vet a call. Then you can hide the one pill in his food. Problem solved.
Keep in mind that tapeworms come from fleas so you will need to treat your flea problems if you don't want it to return.
You can try another vet or you can find a vet in your area that makes housecalls. There are a lot of mobile vets cross the country now who would be happy to come to your home.
If you decide to call a different vet, just be sure and let them know that you are dealing with a semi-feral cat.
My vet does it for me all the time. When I have a rescue dog who has worms that look like white rice or sesame seeds (dead ones) I just give the vet a call and describe them. They always tell me that I can swing by and pick up some meds.
Does this help?
No. It's not. You need to realize, too, that tapeworms are from fleas. The pet ingests the flea and this is the flea larvae that you are seeing.
So be sure and get some frontline or other flea control and then you can avoid the problem.