Flukes
Flukes are another kind of parasitic flatworm that infect a series of hosts, starting with the lowliest animals and ending up in the livers and lungs of humans. Typically, free-swimming fluke larvae or miracidia infect snails and are then released in the form of cercariae. This next stage of the fluke's larval development then infects various freshwater plants and animals and forms cysts which contain metacercariae: the infective stage of the fluke larva.
Infection
Like tapeworms, flukes enter their hosts through the mouth, and are usually encountered in uncooked fish and vegetables.
Diseases
Fascioliasis: Fascioliasis occurs when infected plants or fish enter the host's digestive system. The cysts break open and the larvae within migrate to the host's liver through the wall of the intestine. The flukes stay there roughly three months, causing abdominal pains, headaches, anæmia and vomiting; before migrating to the bile duct to lay eggs.
Infection DC: Ingested 15
Incubation: 1 week
Damage: 1d3 Str, 1d3 Con
Additional Effects: The host must make a Fortitude save (DC 15) every four hours or be nauseated for an hour.
Paragonimiasis: Paragonimiasis is caused by lung flukes.The encysted larvae infect crustaceans. After ingestion the flukes migrate to the lungs, where they lay eggs and cause inflammation. This can lead to chest pains, fever and coughing up blood, inflamed tissue and fluke eggs.
Infection DC: Ingestion 16
Incubation: 6 weeks
Damage: 1d4 Str, 1d6 Con
Additional Effects: Infected patients are continually sickened. Each day the host must make a successful Fortitude save (DC 16) or be subject to a a coughing fit for 1d10 rounds. During this fit the subject is nauseated and takes 1d4 points of nonlethal damage per round.