1954 Seward outbreak

The 1954 Seward, Alaska outbreak involved 175 cases in a small seaport town of 3,000 of a neurological disease that initially presented as typical poliomyelitis, but soon did not conform to the standard accepted presentations of poliomyelitis. Doctors acknowledged that the number of cases may have been higher as they could not account for milder cases that went unreported.

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 * "Benign Myalgic Encephalomyelitis (Iceland Disease) in Alaska" in Northwest Medicine, Dec 1957