Risk of Paralytic and Nonparalytic Forms of Poliomyelitis to Household Contacts in Nonepidemic Years

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Abstract
A RECENT study on multiple household cases of poliomyelitis revealed a significant relation between the type of disease observed in the first member to be affected and the subsequent occurrence of clinical infection among other persons in the family.1 It was found that the probability that subsequent cases in the family would be paralytic was greater when the initial case was paralytic than when it was nonparalytic.The results obtained under epidemic conditions prevailing in the 1949 outbreak posed the question of whether a similar phenomenon occurred in nonepidemic years. Accordingly, the available data on household members in families having . . .