Paragonimus:
Metazoa Platyhelminthes Trematoda Plagiorchiida Troglotrematidae Paragonimus

The most significant member of this genus is commonly known as the human lung fluke. As the name implies, these parasitic worms tend to lodge in the lungs of their human hosts, although they will also infect other organs.

You will become infected if you eat an improperly cooked crab or crayfish that is contaminated with this parasite. After ingestion, the worms will enter your small intestine, migrate through your abdominal cavity, and burrow into your lungs. Infection is usually not fatal, although complications may arise from worms which burrow into the brain, heart, or spinal cord.

Symptoms of infection include extreme coughing, bloody mucus, chest pains, and overall general weakness. You may also experience outwardly visible symptoms such as scarring, or the appearance of bleeding spots where the parasite has lodged in tissue near the surface of the skin.