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Myxobolus pfeifferi is an organism that causes boil disease in fish, specifically barbels. It belongs to the genus Myxobolus, which are cnidosporidian protozoans. These organisms are characterized by complex spores containing infective amoeboid sporoplasms and polar capsules with coiled filaments.12

Myxosporidians, including Myxobolus pfeifferi, are primarily parasites of fish, though they can also infect amphibians and reptiles. Infections can be fatal and commonly affect organs like the gallbladder and urinary bladder, as well as the skin, muscles, and gills. After an animal ingests the spores, the sporoplasm is released, which then travels to an organ or tissue to feed, develop, and produce new spores.1

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2 Britannica Sources
  1. myxosporidian
  2. Myxobolus

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