Perkinsus olseni is a protozoan that infects molluscs. Perkinsus olseni belongs to the phylum Apicomplexa.
In Canada, Perkinsus olseni is a federally reportable disease. This means that anyone who owns or works with aquatic animals, who knows of or suspects Perkinsus olseni disease in the animals that they own or work with, is required by law to notify the CFIA.