1. In infections with streptococcus in man, such as acute septic endocarditis, and tonsillitis, there is produced a powerful opsonic immunity.

2. This opsonic immunity is effective towards the streptococcus which has caused infection but may be ineffective in the presence of streptococcus from other sources.

3. Little benefit can be expected from streptococcus vaccines unless they are prepared from the streptococcus which has caused infection.

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Copyright, 1909, by The Rockefeller Institute for Medical Research New York
1909
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