Persistence of Neorickettsiae helminthoeca in an Endoparasite of the Pacific Salmon

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Abstract
Silver salmon ( Oncorhynchus kisutch ) infected with the metacercariae of the "salmon poisoning" fluke ( Nanophyetus salmincola ) remain infected after they have migrated to sea. Metacercariae remain viable in such salmon for at least 33½ months. These metacercariae are capable of transmitting salmon disease ( Neorickettsiae helminthoeca ) to susceptible dogs throughout this period.