1934 Los Angeles atypical polio outbreak

The 1934 LA County Hospital epidemic is the first recorded cluster outbreak resulting in what is now known as Myalgic Encephalomyelitis.

Epidemiological Study Of An Epidemic, Diagnosed As Poliomyelitis, Occurring Among The Personnel Of The Los Angeles County General Hospital During The Summer Of 1934 - ''Public Health Bulletin no.231-240 1936-1938 By: A.G. Gilliam

Observations On The Epidemic Of Polio-Encephalitis In Los Angeles, 1934* - California And Western Medicine By: E.C. Rosenow, MD; F.R. Heilman, M.D.; and C.H. Pettet, M.D.