Abstract
CONCLUSIONS The pathogenicity of 245 strains of Mycobacteria was tested by means of guinea pig inoculations; in another laboratory the same cultures were tested for their cord-forming ability in the liquid medium. Both methods, the guinea pig inoculation and the cord-forming ability, recognized 192 lethal and 40 saprophytic strains with equal efficiency. The two above mentioned groups of Mycobacteria represented 94.3 per cent of the strains tested. The remaining material consisted of eight N strains showing rudiment of cord formation. These strains were not lethal to guinea pigs but caused considerable morbid lesions in them. The origin of these strains from the lethal ones was presumed. Five isoniazid-resistant R strains formed true cords; they were classified as lethal. Two of these strains were lethal to guinea pigs; when injected intravenously, the other three were lethal to mice.
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