Abstract
If a stock culture of Streptococcus hemolyticus is grown on 5% rabbit blood-agar plus 10% commercial antistreptococcus serum, the hemolytic zone surrounding each plate colony is at times 100% to 200% greater than the control area of hemolysis on routine blood-agar plus 10% normal horse serum. A typical example of this auxolytic effect is recorded in Table I (serum A).
The percentage increase in average hemolytic area varies (a) with the concentration of the auxolytic serum tested and (b) with the selected strain of S. hemolyticus. Typical variations are recorded in Table II
The above recorded auxohemolytic effects are reminiscent of the paradoxic growth-acceleration of certain bacteria in the presence of homologous specific immune serum. 1
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