SUMMARY: Culture fluids of fifty-two strains of spp. were examined for antibacterial activity. Four groups were distinguished: () six strains equally active against a strain of and strain 1; () sixteen strains much less active against than against 1; () fourteen strains inactive against , active against 1; () sixteen strains inactive against both and 1, of which six were active against strain 2.

Examination of pure antibiotic substances isolated from the culture fluids of nine of the strains showed them to be both bacteriostatic and bactericidal; they were very active against mycobacteria and effective to a lesser degree against other Gram-positive bacteria. They were ineffective against Gram-negative bacteria and fungi.


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