Search results
Results from the WOW.Com Content Network
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 ...
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.
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.
A. lumbricoides eggs are extremely resistant to strong chemicals, desiccation, and low temperatures. The eggs can remain viable in soil for months or even years. [9] Eggs of A. lumbricoides have been identified in coprolites in the Americas, Europe, Africa, the Middle East, and New Zealand, the oldest ones being more than 24,000 years old. [12]
Metagonimus yokogawai has adult flukes that parasitize the small intestine and causes inflammation. [5] This species was discovered by Fujiro Katsurada with egg samples from Japan and Taiwan [6] With this discovery, he was able to make a new genus of trematodes that this new parasite would fall under [6] The size of these eggs are about 29 μm. [7]
Infection in humans can be detected via imaging, but because larvae may appear as a mass, most diagnosis occurs after surgical removal. [16] [8] [9] Diagnosis in animals is typically done by characterizing eggs in fecal matter. Since most tapeworm infections within the genus Spirometra have similar egg morphology, species characterization is ...
Microscopic identification of eggs, or more rarely of the adult flukes, in the stool or vomitus is the basis of specific diagnosis. The eggs are indistinguishable from those of the very closely related Fasciola hepatica liver fluke, but that is largely inconsequential since treatment is essentially identical for both. [citation needed]