The only known survivor of a mysterious illness that killed 76 other bottlenose dolphins in Florida's Indian River Lagoon was released by SeaWorld staff on Tuesday. The dolphin was found stranded and ill with parasites and respiratory disease in June and nursed back to health. Investigators don't know what caused the illnesses and deaths in this group of dolphins, but they believe the event is not caused by morbillivirus that has been linked to an estimated 700 dolphin deaths along the East Coast this year, although it could be an exacerbating factor.

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