Abstract
Summary
Immune rabbit serum, injected intraabdominally into mice, protects them against experimental infection produced by the intranasal inoculation of Hemophilus pertussis. By precipitation in 50% saturated sodium-sulfate solution (37°C), a globulin fraction was prepared which had essentially the same protective capacity and agglutinating titer as the original serum, but only one-third of its content of protein.
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