Paragonimiasis is an infection that is caused by a parasitic worm called a fluke. The infection is caused by eating raw, undercooked, pickled, or salted crustaceans, such as crab or crayfish. The infection may also be caused by eating raw meat, such as wild boar. Sometimes, the infection in transmitted by using contaminated food utensils. Not long after the infection, larvae will inhabit the lungs. It may also spread to other organs such as the brain.