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Hi. My name is***** Thank you for your question. Did this little white worm look like a piece of rice? Did it look like a piece of spaghetti? Was this feces in the litter box inside of your house?
Ok. If these looked like little rice segments flattening out and then thickening up and repeating this, then the suspicion is high for tapeworms. Tapeworms can be picked up by eating a flea or by eating a mouse as the most common causes. Placing the revolution on her wouldn't treat for tapeworms. The medication needed to treat tapeworms is praziquantel and it is given as a single oral dose to treat the tapeworms that are in the intestinal tract. The key to preventing them from getting them again is to make sure they are kept on flea prevention (aka the Revolution), and to hope they don't catch any mice. The blood in her urine, that could be due to a urinary tract infection. What would be a good idea is to take her tomorrow to your vet so they can evaluate a urine sample and to then use the correct dewormer for the tapeworm treatment. They may want to do a fecal exam to make sure there are no other parasites at hand.
Tapeworms can't be passed to people or other animals by these worms. This stage of the organism isn't infectious to people or pets. If it is the one passed by fleas, it actually has to be eaten by a flea and then the flea eaten by something to get it. She may have gotten it from eating a mouse.
The eating of a flea shouldn't have allowed tapeworms to get to the stage to see them pass with stools in that time frame. Could she have had a single flea get on her at some point in the past and she ate it? That is possible.
I glad to help and hope everything goes well!