Because tapeworm infections are mainly caused by ingesting infected fleas, cats who have fleas or are exposed to flea-infested environments may be at a higher risk of a tapeworm infection. Since tapeworms can also be transmitted through infected hosts (like rodents, rabbits, and birds) cats who spend time outside, hunt or eat these animals, or live in an indoor environment with access to these animals, may be at a higher risk for a tapeworm infection.