Here are two types of parasites that can infect the lungs. The first is of the microscopic variety and the second is a type of roundworm.
STRONGYLOIDES STERCORALIS – this is the most unusual of all of the parasites known to man. They can live with or without a host. The females can reproduce without a male. They infect the skin, then migrate to the lungs where they are coughed up and swallowed by the host. They then settle into the small intestine where they mature and reproduce.
LUNG FLUKES – are found in the lungs and are sometimes mistaken for lung cancer on x-rays. They cause cough, blood tinged mucous, and vague chest pains.