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1. The mouse protection test used for the standardization of anti-pneumococcic serum Type I and II is very unreliable. 2. The specific polysaccharide precipitation test can be used to establish the comparative value of a test serum to a standardized serum. 3. The polysaccharide used for such tests does not have to be of the highest purity.

THE STANDARDIZATION OF ANTIPNEUMOCOCCIC SERUM TYPES I AND II