The addition of testicle extract to cultures of 20 different bacteria just prior to inoculation enhances their infectious activity to a high degree.
Kidney extracts enhance the infections of staphylococci to a less degree than testicle extracts, while spleen extracts never give rise to enhancement, and often cause the lesion to be less than would ordinarily be the case.
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Copyright, 1931, by The Rockefeller Institute for Medical Research New York
1931
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