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1.
Antibiotic susceptibilities of Propionibacterium acnes in Japan were determined. Erythromycin‐resistance was found in 10.4% (5/48) of the strains, and four of these were cross‐resistance to clindamycin. Although the erythromycin ribosome methylase gene erm(X) was looked for, no strain carrying erm(X) was found. Sequencing analysis revealed that all of the erythromycin‐resistant strains had a mutation in the peptidyl transferase region of the 23S rRNA gene: G2057A, A2058G, or A2059G. Consequently, our results show that P. acnes resistance to macrolides is caused by a mutation in the 23S rRNA gene, and has been increasing in Japan.  相似文献   

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A total of 203 Klebsiella strains isolated from patients with acute intestinal diseases were studied. The biochemical variants were determined by taking into account the complex of such signs as the capacity for producing indole, hydrolyzing urea, utilizing sodium malonate, fermenting inositol, dulcitol, sorbose, adonitol, synthesizing acetylmethylcarbinol, reacting with methyl red. The strains under study were found to belong to 36 K-types. Klebsiella strains with K-antigens 20, 2, 62, 60, 21, 40 showed the highest isolation rate.  相似文献   

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The anaerobic bacteria occurring in paddy soils sampled from fields belonging to the Rice Research Station at Ohmagari in Akita Prefecture, Japan, were surveyed from May to November, 1974. Irregularly shaped rods predominated which were found to be gram-positive, strictly anaerobic, catalase-positive and not heat-resistant; populations were estimated at 105–107 cells/g dry soil throughout the entire survey period. On the basis of their morphological and physiological characteristics these bacteria were identified as Propionibacterium. Most strains belonged to P. lymphophilum and P. granulosum.  相似文献   

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Thirty-three uropathogenic strains ofPseudomonas aeruginosa were investigated for hemolytic activity in both bacterial broth culture filtrates and isolate lyzates, resistance to bactericidal activity of fresh human serum, resistance to six antibiotics and plasmid DNA profile. Twenty-four of the 33 (73%) bacterial filtrates showed lysis of rabbit erythrocytes, as did the three after guinea-pig erythrocyte treatment. Twelve of 33 isolate lysates showed in parallel lysis of both types of erythrocytes used. Serum resistance was found in 17 (52%) isolates, intermediate resistance in 15 (45%) isolates and only one isolate showed serum sensitivity. Resistance to antibiotics was detected as follows (in %): tetracycline 94, kanamycin 79, chloramphenicol 76, septrin 73, ampicillin 64, streptomycin 45, gentamicin 18. None of the isolates investigated showed resistance to colistine. With the exception of one isolate, plasmid DNA was detected in allP. aeruginosa strains.  相似文献   

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Following cardiothoracic surgery, deep sternal wound infection (SWI) remains one of the most severe complications. Recently, Propionibacterium acnes has been suspected as an etiological agent of deep SWI. However, this bacterium constitutes part of the resident micro-flora of the human skin. Consequently, findings of P. acnes in invasive samples are difficult to value. The aims of this study were to develop and optimize a pulsed-field gel electrophoresis (PFGE) protocol for P. acnes, in order to investigate the genetic homogeneity/heterogeneity of P. acnes isolates from multiple tissue samples (predominantly biopsies), collected at different locations, from 12 patients during cardiothoracic reoperation. There were 24 distinguishable PFGE fingerprints identified among the P. acnes isolates (n=54). Five (42%) of the patients carried only isolates that were interpreted as presumably clonally related. From the remaining seven patients, two or three different P. acnes clones were cultured, however, from six of them, the clones were identified in multiple samples. P. acnes may be a relatively frequent etiological agent of postoperative cardiothoracic infections. Existence of several clonally related P. acnes isolates derived from multiple samples from patients suffering from deep SWI after cardiothoracic surgery has not previously been shown.  相似文献   

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Some patients with Mycoplasma pneumoniae infection are clinically resistant to antibiotics such as erythromycin, clarithromycin, or clindamycin. We isolated M. pneumoniae from such patients and found that one of three isolates showed a point mutation in the 23S rRNA gene. Furthermore, 141 EM-sensitive clinical isolates of M. pneumoniae were cultured in broth medium containing 100 microg/ml of erythromycin (EM). Among 11 EM-resistant strains that grew in the medium, point mutations in the 23S rRNA were found in 3 strains at A2063G, 5 strains at A2064G and 3 strains at A2064C. The relationship between the point mutation pattern of these EM-resistant strains and their resistance phenotypes to several macrolide antibiotics was investigated.  相似文献   

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The objective was to study the prevalence and antibiotic susceptibility patterns of Propionibacterium acnes strains isolated from patients with moderate to severe acne in Stockholm, Sweden and to determine the diversity of pulsed-field gel electrophoresis types among resistant P. acnes strains. One hundred antibiotic-treated patients and 30 non-antibiotic-treated patients with moderate to severe acne participated in the investigation. Facial, neck and trunk skin samples were taken with the agar gel technique. The susceptibility of P. acnes strains to tetracycline, erythromycin, clindamycin and trimethoprim-sulfamethoxazole was determined by the agar dilution method. The genomic profiles of the resistant strains were determined by pulsed-field gel electrophoresis. In the group of patients treated with antibiotics, resistant P. acnes strains were recovered in 37%, while in the non-antibiotic group of patients the incidence of resistant strains was 13%. Thus antibiotic-resistant P. acnes strains were significantly more often isolated from antibiotic-treated patients with moderate to severe acne than from non-antibiotic-treated patients (odds ratio, 3.8; P=0.01). There was a genetic diversity among the P. acnes strains. Forty-four different patterns of SpeI DNA digests were detected and two predominant clones were found. P. acnes strains exhibited different antibiotic susceptibility patterns and identical genotypes or vice versa. A person can be colonized with different strains with varying degrees of antibiotic resistance. The risk of increased resistance of P. acnes must be considered when treating acne patients with antibiotics, and especially long-term therapy should be avoided.  相似文献   

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The purpose of the study was to characterize the resistance mechanism of 36 clindamycin (CL) and erythromycin (EM) resistant Propionibacterium acnes strains and 27 tetracycline (TET) resistant P. acnes isolates, collected from nine European countries, both from acne patients and from patients with different infections. PCR and sequencing of the genes encoding domain V of 23S rRNA for CL and EM resistant strains and 16S rRNA for TET resistant strains were performed. Pulsed-field gel electrophoresis was used as a typing method to establish the relationship between resistance genotypes and pulsed-field types. Several unique resistant genotypes were found to be distributed throughout Europe. P. acnes CL and EM resistant strains carrying one of the mutations within the 23S rRNA were predominantly isolated from Swedish acne patients (64%) compared to other infections (43%), OR=2.33 [CI=1.16-4.69]. Of 36 P. acnes isolates tested, none was found to carry the erm(X) resistance gene. Forty-four percent of TET resistant strains were found to carry a G-C transition in the 16S rRNA of the small ribosomal subunit and all these strains were isolated from Swedish acne patients. MIC of TET among all strains carrying this G-C mutation (n=12) was 32 mg/L and the MIC range for the strains where no mutation was detected ranged from 2 to 8 mg/L. The MIC values of TET were unaffected by the presence of reserpine, a well-known inhibitor of efflux pumps. Those TET resistant strains harbouring the mutation at 16S rRNA were clustered in one pulsotype. For TET resistant strains where no mutation was found, greater variability was noticed. No correlation was noticed between different resistance genotypes of CL and EM resistant strains and pulsed-field types.  相似文献   

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T.J. BRITZ AND K-H.J. RIEDEL. 1991. Phenotypic results from 81 tests conducted on 73 propionibacteria, including five type strains, 22 reference strains, unidentified propionibacteria and strains isolated from dairy sources, were analysed by numerical taxonomy. Characters giving uniform results were excluded. With the simple matching coefficient and the single linkage cluster analysis, 61 cultures were recovered in five major clusters. Final linkage of all the Propionibacterium cultures examined was at the 77% S-level. The results clearly showed that it was possible to distinguish between the 'classical' and 'cutaneous' Propionibacterium spp., corresponding with the type habitat of each group. The major 'classical' clusters were equated with the P. freudenreichii, P. thoenii, P. jensenii and P. acidipropionici species, while the only major 'cutaneous' cluster was equated with the P. acnes species. The major clusters were identified by relating them to specific type strains and by comparing phenotypic characteristics. The differentiating characteristics of each cluster were determined. The largest cluster, representing 37% of the strains, was equated with P. jensenii but contained cultures that produced an atypical brown/red pigment. These strains, although positively identified as P. jensenii , could also be identified as the 'old' P. rubrum ' species. Thus if pigmentation is used as differential characteristic two distinct groups of propionibacteria could be identified within the P. jensenii species.  相似文献   

14.
Propionibacterium acnes may have a role in Kawasaki disease. Filtrates from cultures of P acnes isolated from cervical lymph node biopsy specimens and blood samples from patients with Kawasaki disease were studied and compared with samples from control subjects. After inoculation of human embryo liver cells with filtrates from the patients a cytopathogenic effect and vacuolation were seen. A specific cytopathogenic substance was found in only the filtrates of cultures from patients with Kawasaki disease; it was a protein of about isoelectric point 7.0 with a molecular weight of about 100,000 daltons. The amount of IgG antibody to this cytopathogenic protein was measured by enzyme linked immunosorbent assay (ELISA) in serum samples taken from 63 patients in the acute phase of Kawasaki disease (mean 5.2 (SD 1.1) days after onset of illness), 45 in the subacute phase (mean 23.6 (3.3) days), and 51 in the convalescent phase (mean 18.5 (4.1) months) and from 102 control subjects matched for age. Titres of IgG antibody were significantly raised in patients with Kawasaki disease, particularly in the acute and subacute phases of the illness, compared with in the control subjects. Titres of IgG antibodies to cytopathogenic protein were found to be low in normal children below the age of 4 years but they increased with age thereafter. This may explain why outbreaks of Kawasaki disease, which is most common in children aged under 4, occur every three years.  相似文献   

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A degoke , G.O. 1985. Characteristics of some unclassifiable strains of staphylococci isolated from goats and sheep. Journal of Applied Bacteriology 59 , 257–262.
Fourteen strains of catalase-positive, Gram-positive and coagulase-negative cocci that were sensitive to 20 μg/ml of furazolidone were isolated from goats and sheep. Two of the strains had glycerol with glucose teichoic acids whilst another possessed glycerol, glucose, glucosamine and acetylglucosamine teichoic acids. Six strains had peptidoglycan type L-Lys-Ala-Gly4 peculiar to Staphylococcus sciuri and Staph. lentus but other phenotypic characters were different from those of Staph. sciuri and Staph. lentus . The guanine plus cytosine (G + C) content of the DNA determined for three of the strains examined ranged from 32.9–34.6 mol %. The coagulase-positive staphylococcal strain of caprine origin examined had glycerol and glucosarnine teichoic acids in addition to peptidogylcan type L-Lys-Gly5–6. The characteristics of the strains of staphylococci described herein are different from those already described in the literature.  相似文献   

17.
The conjunctivitis produced by Neisseria gonorrhoeae is the less frequently reported clinical form of gonococcal infection. We aim to phenotypically characterize N. gonorrhoeae isolated from conjunctivae sites. A total of six cases of this disease were notified in the Camagüey province, Cuba. All the strains isolated were penicillin-producing, showed the serogroup WI and exhibited the same antimicrobial susceptibility pattern and plasmid profile (2.6-3. 2-24.5). The results contribute to the characterization of N. gonorrhoeae strains circulating in our environment.  相似文献   

18.
Fourteen strains of catalase-positive, Gram-positive and coagulase-negative cocci that were sensitive to 20 micrograms/ml of furazolidone were isolated from goats and sheep. Two of the strains had glycerol with glucose teichoic acids whilst another possessed glycerol, glucose, glucosamine and acetylglucosamine teichoic acids. Six strains had peptidoglycan type L-Lys-Ala-Gly4 peculiar to Staphylococcus sciuri and Staph. lentus but other phenotypic characters were different from those of Staph. sciuri and Staph. lentus. The guanine plus cytosine (G + C) content of the DNA determined for three of the strains examined ranged from 32.9-34.6 mol %. The coagulase-positive staphylococcal strain of caprine origin examined had glycerol and glucosamine teichoic acids in addition to peptidoglycan type L-Lys-Gly5-6. The characteristics of the strains of staphylococci described herein are different from those already described in the literature.  相似文献   

19.
Biotyping of Propionibacterium acnes isolated from normal human facial skin   总被引:1,自引:0,他引:1  
Biochemical and serological characteristics of 128 strains of Propionibacterium acnes isolated from the facial skin of healthy Japanese volunteers were compared with the three standard strains of the American Type Culture Collection, ATCC 6919, 11827, and 11828. Accordingly, the isolated strains of P. acnes were classified into five biotypes (B1 to B5) on the basis of fermentation tests of ribose, erythritol, and sorbitol. Two serotypes were distinguished by the agglutination test. P. acnes belonging to serotype I had galactose as a cell wall sugar, whereas those of serotype II lacked galactose. The strains of serotype I were distributed among all five biotypes (B1 to B5); however, those of serotype II consisted only of one biotype (B2). A term "sero-biotype" was introduced to differentiate and carefully classify the isolates. The predominant sero-biotypes differed with the individual and region of the facial skin. In general, strains of sero-biotype IB1, IB3, IB4, and IIB2 were more frequently isolated than those of sero-biotype IB2 and IB5. Thus, for routine assay work, serotyping of P. acnes as based on erythritol and sorbitol fermentation is both practical and applicable.  相似文献   

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