Trichinellosis (Trichinosis)

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• 旋毛虫 in Japanese

Pathogen and Taxonomy

• The genus Trichinella has genetically distinguished but taxonomically still undetermined genotypes other than usual species
• The biggest morphological classification is based on the presence/absence of collagen capsule surrounding the pathogen in cysts in infected muscles

※Manson's Tropical Infectious Diseases 24th ed. (published in 2023) describes that T. spiralis has several subspecies but according to [NCBI Taxonomy Browser] and the following articles subspecies written in Manson's are classified as species.

Pozio, E., Rosa, G. la, Murrell, K. D., & Lichtenfels, J. R. (1992). Taxonomic Revision of the Genus Trichinella. The Journal of Parasitology, 78(4), 654. https://doi.org/10.2307/3283540

Zarlenga, D., Thompson, P., & Pozio, E. (2020). Trichinella species and genotypes. Research in Veterinary Science, 133, 289–296. https://doi.org/10.1016/j.rvsc.2020.08.012

Encapsulated	Non-encapsulated
Trichinella spiralis Trichinella nativa Trichinella nelsoni Trichinella britovi Trichinella murrelli Trichinella patagoniensis	Trichinella pseudospiralis
Infect only mammals	Infect birds and mammals, occasionally humans