The number of poliomyelitis cases reported in the U.S. as a whole was running about 8% ahead of last year: 2,543 cases since the disease year began April 1, as against 2,361. Local health officers ...
Askonas, B. A., Humphrey, J. H., and Porter, R. R., Biochem. J., 63, 412 (1956).
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