A new hybrid strain of an oxytetracycline-producing organism, Streptomyces rimosus.

A new strain, Streptomyces rimosus LS-T hybrid, characterized by a lower level of foaming and higher antibiotic activity as compared to the other active strains of S. rimosus, is obtained as a result of selection among prototrophic recombinant forms of strains LS-T293 and BS-21. The studies on strain LS-T hybrid show the possibilities of combining properties of different strains of S. rimosus in the hybrid forms. The occurrence of new properties in the hybrid forms is detected.