Cow: Intermediate host to the larval stages of beef tapeworm (Taenia saginata)
a free-swimming larval stage in which a parasitic fluke passes from an intermediate host (typically a snail) to another intermediate host or to the final vertebrate host
http://tinyurl.com/gdhosting
vector
Intermediate host - snail definitive host - cattle/sheep
An intermediate host is an animal that is needed for a parasite to develop through one or more stages of life before being transferred to a definitive host in which the parasite will develop into sexual maturity. A reservoir host is a host that may be an intermediate or definitive host but provides a place where a parasite may "hang out" while enviromental conditions are less than optimal.
Pamela Lane Moriearty has written: 'Hypersensitivity and other host reactions in human schistosomiasis'
Cats and dogs
reproduces asexually.
deer tick
Schistosomiasis, also known as bilharziasis or snail fever
Schistosomiasis, or bilharzia, is usually not spread directly from one person to another. It usually spreads by exposure to water in which the snails that serve as the host for the parasite are found. An infected person passes the parasites on to the snails, where the parasite continues its life cycle, and is released into the water to infect another person.