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Estimation and identification of Streptococcus dysgalactiae protective antibody in sera of rabbits and cattle.

Rabbit and cow anti-Streptococcus dysgalactiae sera were tested by bacterial agglutination, complement fixation, hemagglutination, and immunodiffusion for the presence of antibody. The results of these tests were compared with mouse-protection studies on the same serum to estimate which in vitro test would best reflect the in vivo protective capacity of serum. Identification of the antibody constituents responsible for the mouse protection, hemagglutination, and complement fixation titers were established by reacting whole and diluted antisera with mercaptoethanol before and after testing. Res