THE ISOLATION OF POLIOMYELITIS VIRUS FROM HUMAN EXTRA-NEURAL SOURCES. IV. SEARCH FOR VIRUS IN THE BLOOD OF PATIENTS

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

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}

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}

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

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