[Pathogenicity test for staphylococci by the use of adrenaline (author's transl)]

Pathogenic staphylococci will grow in broth containing 50 mug/ml adrenaline at 37 degrees C, while apathogenic ones tolerate a concentration of 20 mug/ml only. They are completely inhibited at higher adrenaline levels. After 6 hr incubation, pathogenic germs show growth up to 100-250 mug/ml adrenaline, apathogenic ones up to 40 mug/ml.