Kudoa is a genus of myxozoan which parasitizes estuarine and marine fishes, and are commonly seen in skeletal musculature. There are many Kudoa species across the globe. Most infected fish probably have no disease signs. kudoa is an economic problem in fisheries, as fillets of heavily infected fish can become jelly-like if not handled appropriately. Kudoa has been also identified in other tissues including the kidney, nervous tissue, and gut wall. Kudoa probably has a complex life cycle, including a fish and a polychaete worm host. A single Kudoa species, kudoa septempunctata, has been identified recently as a cause of food poisoning in humans, but only after consumption of raw, infected olive flounder. Cooked fish pose no infection risk to humans.