Human strains of double zone beta hemolytic streptococci produced mastitis in 11 quarters of 4 young cows. Following the acute phase of the infection, the streptococci were eliminated from 6 quarters at various intervals. However, sufficient positive infections were maintained throughout the period of observation to show that the human strains can produce the same degree of infection as bovine double zone beta hemolytic streptococci.
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Copyright, 1938, by The Rockefeller Institute for Medical Research New York
1938
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