THE INCIDENCE OF INFECTION AMONG CONTACTS OF POLIOMYELITIS CASES

^{Section of Preventive Medicine, Yale University School of Medicine, New Haven, Conn.}

Aided by a grant from the National Foundation for Infantile Paralysis, Inc.

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^{Section of Preventive Medicine, Yale University School of Medicine, New Haven, Conn.}

Aided by a grant from the National Foundation for Infantile Paralysis, Inc.

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^{Section of Preventive Medicine, Yale University School of Medicine, New Haven, Conn.}

Aided by a grant from the National Foundation for Infantile Paralysis, Inc.

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