pumaward
Posted : 7/24/2006 3:37:56 PM
Tapeworms usually have an intermediate host that must be eaten be the difinitive host to infect the intestinal track (i.e. the dog eats the flee, people eating mealy pork infected with pork tapeworm cysts).
Many nematodes' eggs are passed through the feces and develope in the ground to larvae... once the larvae contaminate food or water and are eaten, they then cause the infection. I do believe, however, some species are passed directly through the feces, although I may be incorrect in that...