Acute anterior poliomyelitis has been reported for some time from Kern County, Calif., where the disease has been of particular importance since 1934 and 1935. During these two years the incidence increased and localized outbreaks occurred, as shown by Gifford and Bogen1 in the annual report of the Kern County health department. Most of the cases in which there was some disturbance of the central nervous system were reported as instances of poliomyelitis from this period until late in 1938, when it became evident that, while some of the milder, nonparalytic conditions were due to the virus of this disease, many could be attributed either to the western equine encephalomyelitis virus or to the St. Louis encephalitis virus or to both, as was shown by Howitt2 and by Buss and Howitt.3 After laboratory differentiation was established, it was apparent that more than one variety of neurotropic virus
HOWITT BF, BUSS WC, SHAFFRATH MD. ACUTE ANTERIOR POLIOMYELITIS IN KERN COUNTY, CALIFORNIA. Am J Dis Child. 1942;64(4):631–648. doi:10.1001/archpedi.1942.02010100057005
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