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Baylisascaris procyonis
''Baylisascaris procyonis'', common name ''raccoon roundworm'', is a roundworm nematode, found ubiquitously in raccoons, the definitive hosts. It is named after H. A. Baylis, who studied them in the 1920s-30s, and Greek ''askaris'' (intestinal worm). Baylisascaris larvae in paratenic hosts can migrate, causing visceral larva migrans (VLM). Baylisascariasis as the zoonotic infection of humans is rare, though extremely dangerous due to the ability of the parasite's larvae to migrate into brain tissue and cause damage. Concern for human infection has been increasing over the years due to urbanization of rural areas resulting in the increase in proximity and potential human interaction with raccoons.
==Transmission==
In North America, ''B. procyonis'' infection rates in raccoons are very high, being found in around 70% of adult raccoons and 90% of juvenile raccoons. Transmission occurs similarly to other roundworm species, through the fecal-oral route. Eggs are produced by the worm while in the intestine, and the released eggs will mature to an infective state externally in the soil. When an infected egg is ingested, the larvae will hatch and enter the intestine. Transmission of ''B. procyonis'' may also occur through the ingestion of larvae found in infected tissue.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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