INDUCTION OF ACQUIRED RESISTANCE IN GUINEA PIGS WITH DEFATTED MYCOBACTERIUM TUBERCULOSIS VACCINES

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Abstract
Residues of mycobacteria exhaustively extracted with neutral organic solvents have been shown to produce a level of resistance against tuberculosis in guinea pigs comparable to that produced by BCG. Disruption of defatted tubercle bacilli in adjuvant eliminated the acid-fast staining property of the residue, but immunizing and sensitizing properties were retained in the fraction which sedimented at 44,000 X g. To demonstrate these activities with 50 ug of vaccine, it was necessary to use Bayol-Arlacel adjuvant. A similar quantity of vaccine given in saline was inactive. A defatted vaccine prepared from a virulent strain of Mycobacterium tuberculosis recently passed through a guinea pig was significantly more im-munogenic than a similar vaccine prepared from H37Ra.