Pseudomonas aeruginosa is an opportunistic pathogen that can cause a variety of diseases especially in the hospital environment. However, this pathogen also exhibits antimicrobial activity against ...Gram-positive bacteria and fungi. This study aimed to characterize different virulence factors, secreted metabolites and to study their role in the suppression of Candida growth. Fifteen P. aeruginosa isolates were tested for their anticandidal activity against 3 different Candida spp. by the cross-streak method. The effect on hyphae production was tested microscopically using light and scanning electron microscopy (SEM). Polymerase chain reaction was used in the detection of some virulence genes. Lipopolysaccharide profile was performed using SDS-polyacrylamide gel stained with silver. Fatty acids were analyzed by GC-MS as methyl ester derivatives. It was found that 5 P. aeruginosa isolates inhibited all tested Candida spp. (50-100% inhibition), one isolate inhibited C. glabrata only and 3 isolates showed no activity against the tested Candida spp. The P. aeruginosa isolates inhibiting all Candida spp. were positive for all virulence genes. GC-Ms analysis revealed that isolates with high anticandidal activity showed spectra for several compounds, each known for their antifungal activity in comparison to those with low or no anticandidal activity. Hence, clinical isolates of P. aeruginosa showed Candida species-specific interactions by different means, giving rise to the importance of studying microbial interaction in polymicrobial infections and their contribution to causing disease.
can cause intestinal and extra-intestinal infections which ranged from mild to life-threatening infections. The severity of infection is a product of many factors including virulence properties and ...antimicrobial resistance.
To determine the antibiotic resistance pattern, the distribution of virulence factors and their association with one another and with some selected resistance genes.
Virulence properties were analyzed phenotypically while antimicrobial susceptibility was tested by Kirby-Bauer agar disc diffusion method. In addition, 64
isolates were tested for 6 colicin genes,
virulence genes and
, and
resistance genes by polymerase chain reaction (PCR).
Extra-intestinal pathogenic
isolated from urine and blood samples represented a battery of virulence factors and resistance genes with a great ability to produce biofilm. Also, a significant association (P<0.05) among most of the tested colicin, virulence and resistance genes was observed. The observed associations indicate the importance and contribution of the tested factors in the establishment and the progress of infection especially with
(ExPEC) which is considered a great challenging health problem.
There is a need for studying how to control these factors to decrease the rate and the severity of infections. The relationship between virulence factors and resistance genes is complex and needs more studies that should be specific for each area.
Epidemiology and antimicrobial resistance of staphylococci isolated from different infectious diseases Gad, Gamal Fadl M.(Minia University Faculty of Pharmacy Microbiology Department); El-Ghafar, Abd El-Ghafar F. Abd(Minia University Faculty of Medicine Microbiology Department); El-Domany, Ramadan A. A.(Helwan University Faculty of Pharmacy Microbiology Department) ...
Brazilian journal of microbiology,
04/2010, Letnik:
41, Številka:
2
Journal Article
Recenzirano
Odprti dostop
A total of 187 isolates from 470 clinical specimens were collected from three hospitals in El-Minia governorate and identified as 132 Staphylococcus aureus strains and 55 coagulase-negative ...staphylococci (CoNS) strains. Susceptibility of isolates to antimicrobial agents was tested by the agar dilution method. The isolated S. aureus strains showed low resistance to vancomycin (1.5%), amikacin (2.3%) and gatifloxacin (3.8%). Vancomycin was the most effective antibiotic against CoNS. The ampicillin-resistant isolates were tested for β-lactamase production where, 61.7% of S. aureus and 42.9% of CoNS were positive for β-lactamase enzyme. Beta-lactamase producing strains were screened for their plasmid profile using alkaline lysis method. Some of these strains carried at least one plasmid suggesting plasmid-mediated antibiotic resistance. When cells of these strains were exposed to curing agent ethidium bromide, the production of the β-lactamase was lost. Resistance by efflux was studied by a modified fluorometric assay. Addition of uncoupler carbonyl cyanide m-chlorophenylhydrazone (CCCP) increased norfloxacin accumulation in quinolone resistant S. aureus strains, suggesting endogenous energy-dependent efflux. Combinations of ciprofloxacin with four antimicrobial agents against methicillin resistant S.aureus (MRSA) strains were investigated using decimal assay for additivity (DAA) technique. Synergistic interaction was observed between ciprofloxacin and oxacillin. ciprofloxacin plus cefepime and gentamicin appeared to be additive, while ciprofloxacin plus erythromycin was antagonistic.
Introduction: Escherichia (E.) coli can cause intestinal and extra-intestinal infections which ranged from mild to life-threatening infections. The severity of infection is a product of many factors ...including virulence properties and antimicrobial resistance. Objectives: To determine the antibiotic resistance pattern, the distribution of virulence factors and their association with one another and with some selected resistance genes. Methods: Virulence properties were analyzed phenotypically while antimicrobial susceptibility was tested by Kirby-Bauer agar disc diffusion method. In addition, 64 E. coli isolates were tested for 6 colicin genes, fimH, hlyA, traT, csgA, crl virulence genes and bla.sub.-CTX-M-15, bla.sub.-oxa-2, and bla.sub.-oxa-10 resistance genes by polymerase chain reaction (PCR). Results: Extra-intestinal pathogenic E. coli isolated from urine and blood samples represented a battery of virulence factors and resistance genes with a great ability to produce biofilm. Also, a significant association (P<0.05) among most of the tested colicin, virulence and resistance genes was observed. The observed associations indicate the importance and contribution of the tested factors in the establishment and the progress of infection especially with Extra-intestinal E. coli (ExPEC) which is considered a great challenging health problem. Conclusion: There is a need for studying how to control these factors to decrease the rate and the severity of infections. The relationship between virulence factors and resistance genes is complex and needs more studies that should be specific for each area. Keywords: E. coli, virulence, resistance, colicin genes, ESBL, bla.sub.-CTX-M-15, bla.sub.-oxa-2, bla.sub.-oxa-10
A total of 187 isolates from 470 clinical specimens were collected from three hospitals in El-Minia governorate and identified as 132 Staphylococcus aureus strains and 55 coagulase-negative ...staphylococci (CoNS) strains. Susceptibility of isolates to antimicrobial agents was tested by the agar dilution method. The isolated S. aureus strains showed low resistance to vancomycin (1.5%), amikacin (2.3%) and gatifloxacin (3.8%). Vancomycin was the most effective antibiotic against CoNS. The ampicillin-resistant isolates were tested for β-lactamase production where, 61.7% of S. aureus and 42.9% of CoNS were positive for β-lactamase enzyme. Beta-lactamase producing strains were screened for their plasmid profile using alkaline lysis method. Some of these strains carried at least one plasmid suggesting plasmid-mediated antibiotic resistance. When cells of these strains were exposed to curing agent ethidium bromide, the production of the β-lactamase was lost. Resistance by efflux was studied by a modified fluorometric assay. Addition of uncoupler carbonyl cyanide m-chlorophenylhydrazone (CCCP) increased norfloxacin accumulation in quinolone resistant S. aureus strains, suggesting endogenous energy-dependent efflux. Combinations of ciprofloxacin with four antimicrobial agents against methicillin resistant S.aureus (MRSA) strains were investigated using decimal assay for additivity (DAA) technique. Synergistic interaction was observed between ciprofloxacin and oxacillin. ciprofloxacin plus cefepime and gentamicin appeared to be additive, while ciprofloxacin plus erythromycin was antagonistic.
Background
Breast cancer is the most common cancer type in women and the most common cause of deaths in women worldwide.
FDG-PET/CT was used in the early stage, estimation of the therapeutic ...response, revelation of recurrent disease, and distal metastasis. However, with the increasing use of FDG PET/CT, sites of accelerated activity have been occasionally found out in unexpected locations which may not correlate with the patient’s clinical history or the expected propagation of the primary malignancy.
The aim of this study is to detect the diagnostic value of PET/CT in breast cancer patients; comparing PET/CT performance with that of contrast-enhanced CT in diagnosis of breast cancer and distant metastasis.
Results
The study included 30 female patients with breast cancer, mean age 53.56 years ± 10.64 (SD), age range 33–73 years. PET/CT detect contralateral breast affection in 2 patients (6.7%), and distant metastasis was seen on PET/CT. Sites of distant metastasis included the bone (
n
= 12), axillary lymph nodes (
n
= 11), cervical lymph nodes (
n
= 6), mediastinal lymph nodes (
n
= 12), abdominal lymph nodes (
n
= 8), liver (
n
= 5), lung (
n
= 11), and other visceral sites metastasis (
n
= 9). PET/CT detected breast lesions with a sensitivity of 100% and specificity of 95.4%. In contrast, the sensitivity and specificity of CT alone were 81.2% and 90.4%, respectively.
Conclusion
PET/CT has superiority over CT alone in revelation of breast lesions and distant metastases.
PDF
