UDDER INFECTION WITH STREPTOCOCCI OF THE SCARLET FEVER TYPE : II. A STUDY OF THE SCARLET FEVER TYPE OF STREPTOCOCCI ISOLATED FROM THE UDDER OF THE COW.

The streptococcus isolated from the udder of a cow on a farm where an outbreak of scarlet fever originated has been correlated with known scarlet fever strains. This streptococcus and another also isolated from the udder of a cow are indistinguishable in cultural characters and certain antigen affinities from S. scarlatinæ. Skin tests indicate that the strain isolated from the milk of the cow in a herd to which the scarlet fever epidemic was attributed produced a toxin which was neutralized with scarlet fever antitoxin.