The Journal of Experimental Medicine
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The Journal of Experimental Medicine, Vol 62, 827-847, Copyright, 1935, by The Rockefeller Institute for Medical Research New York

ARTICLE

EXPERIMENTAL STUDIES ON ENCEPHALITIS : IV. SPECIFIC INACTIVATION OF VIRUS BY SERA FROM PERSONS EXPOSED TO ENCEPHALITIS, ST. LOUIS TYPE, 1933 WITH A NOTE ON THE EVALUATION OF THE RESULTS OF MOUSE TESTS OF SERA



Leslie T. Webster M.D.1, George L. Fite M.D.2, Anna D. Clow 2, and Hugo Muench M.D.2

1 From The Laboratories of The Rockefeller Institute for Medical Research
2 From the Laboratories of The Rockefeller Institute for Medical Research

1. A protection test for measuring serological protective properties against the encephalitis (St. Louis type) virus is described.

2. Normal non-contact sera and sera from persons supposed to have had no exposure to the disease do not protect against the virus. 82.5 per cent of sera from tested St. Louis encephalitis convalescents and at least 66 per cent of sera from tested persons thought to have had the disease do show protective properties.

3. The protective activity of sera is maintained for at least 2frac12 years after onset of the disease. In vitro aging of serum decreases its activity.

4. Protection tests indicate that the virus was present as early as 1932 in Paris, Illinois, spread through the north central states and reached New York in 1933, and was again active in the north central states in 1934.

 Submitted on June 30, 1935


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