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The lung fluke encysts within the tissue of crustaceans until the crustacean is consumed by humans or other animals. Once the fluke has been ingested, enzymes within the digestive tract of the consumer break down the parasitic cysts. The immature parasite continues to mature within the lungs of its new host, feeding on its intestine, and lay eggs.
Paragonimiasis is a food-borne parasitic disease caused by several species of lung flukes belonging to genus Paragonimus. [4] Infection is acquired by eating crustaceans such as crabs and crayfishes which host the infective forms called metacercariae, or by eating raw or undercooked meat of mammals harboring the metacercariae from crustaceans.
Paragonimus westermani (Japanese lung fluke or oriental lung fluke) is the most common species of lung fluke that infects humans, causing paragonimiasis. [2] Human infections are most common in eastern Asia and in South America. Paragonimiasis may present as a sub-acute to chronic inflammatory disease of the lung. It was discovered by Dutch ...
Paragonimiasis is caused by the body's natural immune response to the worms and eggs that are present and also migrating from the intestines to the lungs. [citation needed] As a rule, the parasites begin to cause symptoms about three weeks after ingesting live metacercariae. After about eight weeks, they begin to produce eggs in the lungs.
Definitive hosts of A. cantonensis include wild rodents, especially the brown rat (Rattus norvegicus) and the black rat (Rattus rattus). [27] Paratenic hosts of A. cantonensis include the predatory land flatworm Platydemus manokwari and the amphibians, Bufo asiaticus, Rana catesbeiana, Polypedates leucomystax and Fejervarya limnocharis. [31]
White lung pneumonia is not a specific type of pneumonia, Dr. Ganjian says. “It is simply a term that has been used to describe pneumonia that appears white on chest X-rays,” he explains.
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Liver fluke is a collective name of a polyphyletic group of parasitic trematodes under the phylum Platyhelminthes. [1] They are principally parasites of the liver of various mammals , including humans.