Antibiotic sensitivity of Proteus, Pseudomonas pyocyanea and staphyloccoci isolated from scleroma and ozena patients]

Antibiotic sensitivity of 292 strains of Proteus, 60 strains of Ps, aeruginosa, 309 strains of S. aureus and 88 strains of S. epidermidis isolated from the upper respiratory tract of patients with scleroma and ozena was studied. The cultures of Pr. mirabilis were sensitive to aminoglucosides (54.9-96.2 per cent) and Pr. morganii were sensitive to levomycetin (81.5 per cent) and neomycin (92.6 per cnet). Sensitivity of Pr. vulgaris and Pr. morganii was reliably higher (p less than 0.001) than that of Pr. mirabilis. The strains of Pr. morganii were less sensitive to monomycin (P less than 0.001) and streptomycin (p less than 0.01) as compared to the cultures of other Proteus species tested. The strains of Ps. aeruginosa were sensitive only to gentamicin (90 per cent) and neomycin (81.1 per cent). Most of the strains of S. aureus (85.4-100 per cent) were sensitive to oleadomycin, erythromycin, olemorphocycline, tetraolean, oxacillin, methicillin ceporin, lincomycin, ristomycin, kanamycin, monomycin and gentamicin. Benzylpenicillin (90.8 per cent of the sensitive strains), ampicillin (67.1 per cent), tetracycline (66.7 per cent), levomycetin (68.6 per cent) and streptomycin (38.1 per cent) were less effective. Antibacterial therapy in cases with scleroma and ozena should be directed not only against causative agents of the diseases but also against the microbes developing due to disbacteriosis. Combination of parenteral and local use of the antibiotics in the treatment of chronic clebsiellesis decreased the isolation rate of Proteus and Ps. aeruginosa in the patients.     

Sensitivity of Sherman's propionic acid bacilli to antibacterial preparations and vitamin B12 synthesis

Sherman propionic acid bacilli were sensitive to benzylpenicillin, ampicillin, ceporin, tetracyclines, oleandomycin, oletetrin, tetraolean, sigmamycin, levomycetin and furadonine. Methicillin, oxacillin, monomycin, kanamycin, polymyxin and furazolidone had an insignificant effect on the above organism. The subbacteriostatic concentrations of methicillin, oxacillin, streptomycin, monomycin, kanamycin, neomycin, tetraolean, sigmamycin, polymyxin M and ristomycin increased the biosynthesis of vitamin B12 by Sherman propionic acid bacilli, while benzylpenicillin, ampicillin, tetracyclines, oleandomycin, oletetrin, levomycetin and furadonine in the subbacteriostatic concentrations inhibited this process.     

Comparison of the sensitivity of Pseudomonas aeruginosa cultures that synthesize melanin and other pigments to 12 antibiotics and 5-nitro-8-quinolinol]

Sensitivity of 80 Pseudomonas aeruginosa cultures forming melanin and 80 cultures synthesizing other pigments to amikacin, gentamicin, kanamycin, carbenicillin, levomycetin, monomycin, 5-NOK, polymyxin M, rifampicin, streptomycin, tetracycline, tobramycin and erythromycin was determined. It was found that the cultures of Ps. aeruginosa synthesizing melanin were less resistant to most of the antibiotics that the other representatives of this species.     

Effectiveness of gentamicin sulfate in suppurative-inflammatory processes of varying localization]

Antibiotic sensitivity of 486 strains of grampositive and gramnegative organisms isolated from patients with purulent infections was studied in vitro. Gentamicin was shown to be highly active as compared to kanamycin and other antibiotics against the main causative agents of purulent inflammatory infections including multiresistant E. coli, Proteus, Ps. aeruginosa, Staphylococcus. High efficiency of gentamicin in therapy of peritonitis, septic conditions, purulent postoperative wounds, infections of the urinary tract, pneumonia, etc. (197 patients) was shown. Positive results were obtained in 87.4 per cent of the cases. Side effects, such as albuminuria, hyperthermic reaction, rash, pruritis were registered in 3 per cent of the patients.     

Flora of the purulent foci of patients at an orthopedic traumatology clinic and its sensitivity to antibiotics

A total of 4664 bacteriological analyses of the wound and purulent discharge from orthopedo-traumatological patients were performed within a 6-year period, i.e. from 1971 to 1976. Staphylococci were the dominating microbes of the purulent-inflammatory foci. Its part in the monoculture amounted to 64.5--82 per cent. The specific weight of the monocultures of various microbes decreased during the last 3 years, while the number of the microbial associations increased from 11.6 to 25.4 per cent Staph. aureus predominated in the inflammatory processes (65.8 to 86.5 per cent). Still, during the last 3 years the number of Staph. epidermidis increased from 16.8 to 26.2 per cent. The number of the so called "intermediate" or dissociated type of Staphylococcus, i.e. Staph. albus usually amounted to 7.5--8.1 per cent. In 1976 its number was 12.5 per cent. The pathogenic microbes of the coccal group were usually sensitive to erythromycin, monomycin, levomycetin and kanamycin. Among these microbes only staphylococci preserved their sensitivity to penicillin. The causative agents of purulent processes, i.e. Escherichia, Proteus, Pseudomonas were resistant to most of the antibiotics. Sensitivity to monomycin was preserved by 50 per cent only in Proteus. The microbial associations were mainly sensitive to monomycin and kanamycin.     

Biological properties of sherry yeasts in the presence of antimicrobial preparations

The wine yeasts Cheres were not sensitive to high concentration (500 gamma/ml) of benzylpenicillin, streptomycin, tetracycline, oxytetracycline, chlortetracycline, morphocycline, erythromycin, oleandomycin, monomycin, neomycin, kanamycin, polymyxin, ampicillin, oxacillin, methicillin, ceporin, ristomycin, levomycetin, furadonin and furazolidone. In concentrations of 50 to 500 gamma-ml oleadomycin, chlortetracycline, oxytetracycline, kanamycin and ristomycin inhibited synthesis of the Cheres yeast biomass. Benzylpenicillin, polymyxin, neomycin and ampicillin in concentrations of 50 to 100 gamma/ml had a stimulating effect on the yeast biomass synthesis.     

Antibiotic resistance of Pseudomonas aeruginosa strains isolated from patients with infected burns

Sensitivity to 15 drugs of 248 P. aeruginosa strains isolated from patients with infected burns was studied by the method of agar dilution. All of the strains were resistant to polymyxin M, ceporin, erythromycin and oleandomycin. Most of the strains were resistant to streptomycin, monomycin, ampicillin and rifadin. Moderate resistance of the strains to carbenicillin, morphocycline, vibramycin, kanamycin, tetraolean and tetracycline was observed: the maximum concentrations of these antibiotics (128 microgram/ml) inhibited the growth of 85, 69, 63, 51.8, 43.6 and 41.2 per cent of the strains respectively. Gentamicin proved to be most active against the strains of P. aeruginosa and inhibited 87 per cent of the strains when used in the therapeutic doses. The study provided recomendation of the drugs for parenteral and local use in treatment of burns infected with P. aeruginosa.     

Structure of the microflora of suppurative wounds and its sensitivity to antibiotics]

Clinico-bacteriological examination of patients with purulent infections showed that Staphylococcus was the predominating microflora in the wounds. Simultaneously an increasing role of gram-negative conditionally pathogenic bacteria was shown. Multiple drug resistance was found in the organisms tested. The highest sensitivity levels were observed to gentamicin, kanamycin, tetracycline, levomycetin. It was shown by means of special typing methods that staphylococci of phage group III and Ps. Aeruginosa of serotype II predominated in the infected wounds. When the pathological material contained the antibiotic resistant cultures of Ps. aeruginosa, Proteus, Klebsiella and toxigenic strains of Staphylococcus, a tendency for prolongation of the suppurative process was observed.     

Clinical effectiveness of carbenicillin in suppurative inflammatory processes of varying localization]

The study on sensitivity of clinical strains of the causative agents of purulent infections to carbenicillin showed that 34.6% of the staphylococcal strains, 48.1% of the E. coli strains and 40.3% of the Proteus strains were sensitive to the antibiotic. The strains of Ps. aeruginosa were characterized by moderate sensitivity to carbenicillin. The MTC for most of the isolates ranged within 25-128 microgram/ml. High therapeutic efficacy of carbenicillin in treatment of cases with purulent inflammatory processes of various localization was shown. Positive results were obtained in 82.5% of the adults and 76.2% of the premature infants treated with carbenicillin. A satisfactory therapeutic effect was observed in the cases with sepsis, diffuse purulent peritonitis and abscessing pneumonia treated with carbenicillin in combination with gentamicin.     

Antibiotic sensitivity of the main opportunistic pathogenic aerobic bacteria

Antibiotic sensitivity of 1421 strains of Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Proteus mirabilis, Proteus vulgaris, Pseudomonas aeruginosa and Klebsiella spp. was studied. Gentamicin, levomycetin (chloramphenicol) and ristomycin proved to be the antibiotics of choice in treatment of purulent inflammatory diseases caused by S. epidermidis and S. aureus. For antibiotic therapy of infections caused by gram-negative organisms gentamicin and polymixin might be recommended.     

Sensitivity of pathogenic clostridia to antibiotics]

By the sensitivity levels of the gas infection causative agents, i. e. pathogenic Clostridia to antibiotics, the latter were conditionally divided into 4 groups. The 1st group included the most active antibiotics, such as tetracyclines,, penicillins, cephalosporins, rifampicin, 7-chlor-7-desoxylincomycin. Their minimum inhibitory and bactericidal concentrations did not usually exceed 2 gamma/ml. For most of the strains the inhibitory and bactericidal concentrations amounted to the tenth and hundredth fractions of gamma/ml. The antibiotics of the 2nd group, i. e. erythromycin, lincomycin,ristomycin and levomycetin inhibited multiplication and viability of pathogenic Clostridia in concentrations of 20 gamma/ml. Erythromycin was most active among them The 3rd group consisted of oleandomycin, novobiocin, geliomycin and azalomycin, the minimum inhibitory concentrations of them being 20 to 50 gamma/ml. The antibiotics of the 4th group, i. e. neomycin, monomycin, kanamycin, streptomycin, polymyxin and others affected pathogenic Clostridia at very high concentrations, amounting to the hundrenth and thousandth of gamma/ml.     

Sensitivity of clinical Proteus strains to antibiotics and their combinations]

In 1976 isolation of Proteus from wounds of patients with various purulent processes amounted to 14.5 per cent. Serotypes 0-10, 0-3 and H-3 predominated among the isolates. Sensitivity of 35 clinical strains of Proteus to 10 antibiotics, furagin and nevigramone was studied by the method of serial dilutions in liquid media. All the isolates were highly resistant to the antibiotics except gentamicin, furagin and nevigramone, the MIC of which for most of the strains was 3.12, 1.6-3.12 and 6.25-12.5 gamma/ml, respectively. The effect of 14 combinations of chemotherapeutics was also studied. The combinations of gentamicin with carbenicillin, gentamicin with ampicillin and monomycin with ampicillin proved to be most effective against the Proteus strains tested. The following combinations may be of practical value: monomycin + carbenicillin, kanamycin + ampicillin, kanamycin + carbenicillin, ampicillin + furagin, gentamicin + nevigramone. The combinations of carbenicillin with furagin and gentamicin with furagin were also rational.     

Sensitivity to antibacterial preparations of the pseudotuberculosis bacteria isolated on the territory of the Ukraine]

Sensitivity of 92 strains of the causative agent of pseudotuberculosis isolated in the Ukraine was studied with respect to 26 antibacterial drugs. It was found that the strains of the pseudotuberculous bacteria were sensitive to 17 drugs, i.e. benzylpenicillin, ampicillin, carbenicillin, cephaloridin, chloramphenicol, tetracycline, streptomycin, neomycin, monomycin, kanamycin, gentamicin, polymyxin, colistin, furadontin, nalidixic acid, sulfisoxazol and septrin. No differences in the sensitivity of the strains isolated in various districts of the Ukraine and from various sources were found. By their antibiotic sensitivity the strains isolated in the Ukraine did not differ from the cultures isolated in other districts of the USSR and abroad.     

Antibiotic resistance dynamics of plasma-coagulating staphylococci isolated from patients in 1970-1975]

Resistance of 2345 strains of plasmocoagulating staphylococci isolated from purulent inflammatory foci of surgical patients was studied with respect to the widely used antibiotics by the method of standard paper discs in 1970--1975. It was noted that the cultures resistant to erythromycin and monomycin were more frequent, i.e. from 24.2 +/- 2.5 to 51.4 +/- 3.4 per cent and from 1.0 +/- 0.6 to 28.0 +/- 2.1 per cent respectively, p less than 0.001 in both cases, while the percentage of the strains resistant to benzylpenicillin and tetracycline steadily increased, i.e. from 69.9 +/- 2.4 to 47.0 +/- 2.3 per cent and from 72.8 +/- 2.4 to 28.4 +/- 2.1 per cent respectively, p less than 0.001 in both cases. The number of the resistant cultures to streptomycin and levomycetin slightly changed and was relatively high (about 50 per cent and more). Direct correlation (mean and pronounced) between the amount of levomycetin, tetracycline, erythromycin or monomycin used per citizen of Minsk and the frequency of the strains isolated from the patients to these drugs was noted.     

Sensitivity of Proteus hauseri bacteria to chemotherapeutic preparations depending on the cultivation conditions and on the composition of the nutrient medium]

Sensitivity of 227 Proteus strains isolated from patients was studied comparatively using the agar-diffusion method (disks) and the method of serial dilutions. Marked differences in the numbers of the strains resistant to benzylpenicillin and chloramphenicol were found with the above methods. It was shown that the ingredients of Ploskirev's medium significantly (by 2.8--13.5 times) inhibited the antibacterial activity of streptomycin, neomycin, monomycin, kanamycin, ampicillin and nalidixic acid and had practically no effect on the activity of benzylpenicillin, chloramphenicol and furazolidone. The values of the MIC of the drugs used in the experiment with liquid media correlated with those obtained with Sabouro's medium, which provided recommendation of the latter for determination of Proteus sensitivity by the method of serial dilutions in the solid medium, Cultivation of Proteus at a temperature of 40 degrees C resulted in a decrease of the resistance to most of the drugs tested by (by 3--12.4 times).     

The sensitivity to 12 antibiotics of 125 strains of Streptococcus group B isolated in a maternity home

Sensitivity of 125 strains of group B streptococci isolated from newborns, their mothers and personnel in a maternity home was studied with respect to 12 antibiotics: benzylpenicillin, ampicillin, methicillin, cephalotin, erythromycin, lincomycin, levomycetin (chloramphenicol), oxacillin, tetracycline, streptomycin, gentamicin and ristomycin. The method of serial dilutions in a solid medium was applied. All the strains were sensitive to ristomycin and erythromycin. The predominating number of the strains were sensitive to lincomycin, levomycetin and the beta-lactam antibiotics. Strains resistant or moderately resistant to benzylpenicillin, ampicillin, oxacillin, methicillin and cephalotin were detected. The majority of the strains were resistant to streptomycin, tetracycline and gentamicin. Multiple antibiotic resistance with 2-7 determinants was revealed in 11.2 per cent of the strains. The antibiotic sensitivity of the strains isolated from the newborns, their mothers and the personnel in the maternity home was on the whole similar or insignificantly differed.     

Structure of the antibiotic resistance of the salmonellae found in Transcarpathia]

Resistance of 1280 strains of Salmonella of various serological types isolated in the Zakarpatskaya region within 1967-1976 was studied with respect to benzylpenicillin, streptomycin tetracycline, levomycetin, monomycin, neomycin, erythromycin and oleandomycin. An Increase in the resistance of Salmonella to streptomycin, tetracycline, levomycetin, monomycin and neomycin was shown. During the last years Salmonellae carrying 4-8 resistance determinants were spreading in the region. Among S. typhimurium strains with 7-8 resistance determinants predominated (58.8 per cent). The cases of salmonollosis were mainly due to these strains.     

Antibiotic sensitivity of Vibrio parahaemolyticus isolated in the Turkmene SSR

Sensitivity of 82 cultures of parahemolytic vibrios to 8 antibiotics was studied. It was shown that the majority of the strains were highly sensitive to levomycetin and gentamicin, sensitive to tetracycline, rifampicin, streptomycin, neomycin and kanamycin and resistant to ampicillin.     

Resistance to antibiotics and heavy metal salts of coagulase-positive staphylococci belonging to different biological types (ecovars)

A total of 189 strains of S. aureus isolated from cows, sheep, swines, poultry, monkeys, rabbits, foxes, and humans and 23 strains of S. intermedius isolated from minks and sables were studied. The staphylococci belonged to different biological types (according to the Hajek-Marsalek's scheme) and ecovars (according to the Meyer-Witte's scheme). The strains were studied with respect to their resistance to 10 antibiotics (benzylpenicillin, streptomycin, tetracycline, levomycetin, erythromycin, oleandomycin, neomycin, kanamycin, monomycin, and novobiocin), mercuric chloride and cadmium sulfate. As a whole the frequency of resistance to the above preparations among the staphylococci of the animal origin was not high. Differences in the frequency and range of the resistance between strains belonging to different biological types (ecovars) were shown. The highest number of the resistant cultures was detected among the strains of the biological type E (ecovar canis) and atypical strains of S. intermedius isolated from the minks. The least number of the resistant cultures was detected among the strains of the biological type C1 (ecovar bovis) isolated from the cows. It was found that almost all strains of S. intermedius were resistant to cadmium sulfate. This may be used as an additional characteristic of the species.     

Antibiotic sensitivity and the characteristics of transmissive R plasmids in Shigella belonging to various species]

Sensitivity of 241 Shigella strains isolated from patients at various regions of the USSR in 1975--1978 was tested with respect to 14 antibiotics by the method of serial dilutions. 90.5 per cent of the isolates proved to be resistant to the antibacterial drugs and the greater part of 75.9 per cent of them had multiple resistance. The resistance of the Shigella was most pronounced and frequent with respect to tetracycline, streptomycin, levomycetin, as well as ampicillin and carbenicillin. Gentamicin, cephaloridin, polymyxin M, kanamycin, monomycin, neomycin and rifampicin were highly active against the Shigella. More than 50 per cent of the isolates were sensitive to levomycetin, ampicillin and carbenicillin. Differences in the frequency of the resistant strains and the spectrum of the antibiotic resistance of different Shigella subgroups (species) were observed. The study of 173 multiple resistant Shigella strains showed that about 67 per cent of the strains had a capacity for transduction of the resistance markers into the recipient cells of E. coli. The conjugative R-plasmids were most frequent in Sh. boydii and Sh. sonnei (95 and 95 per cent respectively), less frequent in Sh. flexneri and Sh. newcastle (68 and 53 per cent respectively) and least frequent in the mannitol negative Shigella (25 per cent). The capacity for transduction of R-plasmids in the strains carrying the determinants of resistance to 2 or 3 antibiotics was higher than in the strains carrying the determinant of resistance to one antibiotic. The clinical Shigella strains tested mainly had transmissive R-plasmids of fi--character (79 per cent).