Influence of Age and Sex on Susceptibility and Clinical Manifestations in Poliomyelitis

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Abstract
POLIOMYELITIS has been increasing in incidence in older children and adults for the past twenty-five years.1 2 3 4 5 6 This has been considered by some investigators to be more apparent than real, and accountable for, to a great degree, by alteration in age distribution of the population and increased reporting of nonparalytic cases.1 2 3 4 The most recent study of this problem by Pichel5 revealed a marked change in the proportionate age incidence of the disease, with a relative decrease in the percentage of patients under four years old. Fatal cases showed the same distribution as the total group, when the adjusted number of deaths . . .