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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 ...
In the intestine, the parasite will move into the abdomen and commonly into the lungs. In the lung, the parasites encyst and cross fertilize each other. The cyst eventually ruptures in the lungs and the eggs may be coughed up or swallowed and excreted in the feces. An egg landing in fresh water hatches and releases a ciliated miracidium.
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. Mature lung flukes may breed year-round. P. kellicotti may live up to 20 years within a human host.
Of these, the most common cause of human paragonimiasis is Paragonimus westermani, the oriental lung fluke. [11] Lung flukes require three different hosts in order to complete their life cycle. The first intermediate host is a snail, the second intermediate host is a crab or crayfish, and the definitive host for lung flukes is an animal or ...
Schistosomiasis caused by trematodes of the genus Schistosoma: [13] As of 2005, praziquantel is the primary treatment for human schistosomiasis, for which it is usually effective in a single dose. [14] Clonorchiasis brought on by the Chinese liver fluke Clonorchis sinensis [15]
Tabs for Parasite Biology, Image Gallery, Laboratory Diagnosis, and Treatment Information. Angiostrongylus+cantonensis at the U.S. National Library of Medicine Medical Subject Headings (MeSH) Sydney Morning Herald story of human infection , Example of Angiostrongylus cantonensis human infection: Hard to swallow: slug-eating dare causes rare disease
Fasciola hepatica, a species of liver flukes, has a higher incidence rate in children and females, with more cases of lung fluke and intestinal trematodiases in children. [5] Cases of liver and lung fluke trematodiasis are frequent due to the length of time the trematode can live in host organisms, and increased chances of reinfection. [9]