Transmission
Nanophyetus salmincola is transmitted most commonly by the ingestion of raw, undercooked, or smoked salmon or steelhead trout. Usually this is meant to be ingestion of the muscle of the fish but there have been cases reported in which the suspected agent of transmission was Steelhead roe. Researchers hypothesize, in fish with especially high worm burdens, that the N. salmincola may migrate to many of the fishes tissues, not just the muscle tissue. In a case in 1990 Nanophyetiasis was diagnosed in an individual that is thought to have acquired the disease by simple handling of fresh-killed salmon. The infected individual, ironically, was a researcher studying N.salmincola in juvenile Coho salmon, had inadvertently initiated the infection by hand-to-mouth contact during the 3 month long study.
Read more about this topic: Nanophyetus Salmincola