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Bacteroides were detected in pus and bioptates of the majority of 125 patients with purulent and purulent septic infections of various localization. In 90 per cent of the subjects the bacteroides were detected in association with aerobes, facultative and obligate anaerobic bacteria. The species of the bacteroides and concomitant microflora isolated from the cases with different diseases were defined by endogenic sources of the microbial contamination. Sensitivity of 112 bacteroide strains to antimicrobial agents was tested. Chloramphenicol, clindamycin, metronidazole, cefotaxime and heliomycin proved to be the most efficient. Efficacy of heliomycin was detected in hamsters with experimental bacteroide infection in the buccal sac. Thorough bacteriological examination is required for rational chemotherapy of bacteroide infections.

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Microflora of pathological biosubstrates from 25 patients aged from 18 to 41 years with criminal abortion complications such as sepsis, septic shock, septicemia, and septic pyemia, peritonitis and endometritis of various severity was studied. Obligate anaerobic organisms in association with facultative anaerobes were detected in 84 per cent of the patients. Bacteroids were isolated from operation materials of 36 per cent of the patients. Bacteroids in association with Staphylococcus aureus, peptostreptococci and enterococci were recorded in 16, 8 and 24 per cent of the patients, respectively. Composition of the anaerobic and facultative anaerobic microflora was analyzed in the patients with local and general infections. Antibiotic sensitivity assay of the bacteroids showed that rifampicin, metronidazole, levomycetin (chloramphenicol) and clindamycin were the most active drugs. The use of anaerobic techniques enabled to demonstrate that in patients with purulent septic complications of criminal abortion there prevailed anaerobic-aerobic associations. The results should be considered in treatment of gynecological patients with purulent septic infections.

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Inhibitors of the Clostridium perfringens phospholipase C were prepared from the filtrates of the culture liquids of Streptomyces saracetidus and Streptomyces species using soluble and cross-linked polyelectrolytes. The technological scheme of isolation involves ultrafiltration. The inhibitors produced by the two strains had different chemical nature. The preparation obtained from Str. saraceticus was proved to be a complex of inhibitors that were separated by gel-chromatography into a major polypeptide with a molecular weight of 5500-6500 and a low-molecular weight glycopeptide. The inhibitor obtained from Str. species was found to be a high-molecular weight protein.

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Streptoverticillium mycoheptinicum, a producer of the antifungal antibiotic mycoheptin, was found to produce an inhibitor of Clostridium perfringens phospholipase C. Dynamics of the enzyme accumulation in the culture liquid filtrate was studied. A technique was developed for purification of the inhibitor, which includes adsorption, selective precipitation, ultrafiltration, gel chromatography and isoelectric focusing. The inhibitor was found to be of the peptide nature with the molecular weight of 3500-4000 and to exist in two isoforms with the isoelectric points of 8.15 and 8.50.

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The results of studying aerobic and anaerobic intestinal microflora of rabbits with experimental enterocolitis caused by administration of 7-chlor-7-desoxylincomycin are presented. An increased number of E. coli and some other gram-negative bacteria was noted. It was shown that the quantitative and qualitative composition of the obligate anaerobic microflora was changed: the number of cells of the bacteroids, bifidobacteria, peptococci and peptostreptococci resistant to the antibiotic was low, but the number of clostridia cells resistant to the antibiotic was high. On the basis of a thorough investigation the latter cultures were classified as belonging to Cl. butyricum.

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Actinomycete LIA-0788 was isolated from a soil sample. By its morphological and cultural features the actinomycete was close to Actinomyces pneumonicus and differed from it in the antibiotic properties. This provided classification of actinomycete LIA-0788 as Act. pneumonicus var. altamicus var nov. The culture produced altamycins A and B, new antibiotics. Their physico-chemical characteristics is presented.

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A possibility of developing resistant forms of C1. perfringens during treatment of experimental anaerobic (gaseous) infection with lincomycin was studied. It was shown that treatment of the animals for 7 days resulted in an increase in the resistance by 33-41 times. It was noted that strains with decreased sensitivity to lincomycins had changed morphology and biochemical activity (decreased lecitinase activity, changed biochemical properties), decreased virulence and pathogenicity for animals. So as to obtain the protective effect of the antibiotics in experimental anaerobic (gaseous) infection caused by resistant variants of C1. perfringens it was necessary to increase 1.5-3 times the doses of lincomycin or chlolincocin as compared to the processes induced by sensitive strains.

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