A FRACTION OF TUBERCLE BACILLI POSSESSING PRIMARY TOXICITY

Abstract
Tubercle bacilli separated from young cultures were thoroughly extracted with monochlorobenzene at temperatures never exceeding 50°C. From the soluble material, a fraction corresponding to approximately 1 per cent of the total bacillary weight was separated by fractional precipitation with petrolic ether at temperatures of 0° or 4°C.—depending upon the strain of bacilli.