Paragonimiasis is a type of infectious disease caused by a type of parasite called the Paragonimus worm. It is most commonly found in Southeast Asia, Africa, and Central and South America, though it is also present in Mexico, Japan, Korea and Taiwan. The most common symptom of paragonimiasis is a dry cough that can last for several weeks, months or even years. In some cases, the infection can cause bloody sputum (haemoptysis). This is a symptom of the inflammation that is caused by the presence of the parasite in the lungs. Breathing difficulties, chest pain, wheezing and fever may also be experienced. Paragonimiasis is usually acquired by eating raw, undercooked or improperly cooked crustaceans, such as crabs or crayfish, which are infected with the parasite. The worm is then released after the infected crustacean is eaten, and it can penetrate the gut and travel to the lungs, where it can cause damage to the lung tissue. It is possible to treat paragonimiasis with anti-parasitic medications, but it can take several weeks or even months for the full effects of the medication to be fully evident. In some cases, the parasite can cause significant damage to the lungs and other organs that may require more intensive treatment.