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In August, 1930, the author had occasion to study " mad itch " in 9 out of a herd of 12 dairy cattle in Johnson county, Iowa.
The symptoms were intense pruritus, followed in 24 hours by weakness; death, preceded by convulsions, occurred after a further 24-86 hours
One of the nine animals did not...

Shope, R. E.
Journal of Experimental Medicine, 1931, 54, pp 283-248