The spread of antibiotic resistant bacteria is a worldwide problem. Due to the importance of P. aeruginosa as a multidrug resistant bacterium, this study aimed, through molecular techniques, to detect point mutations in chromosomal genes responsible for the quinolones class of antibiotics resistance. A total of 52 isolates from burn infections were identified using specific primers for P. aeruginosa 16S rDNA. Ciprofloxacin minimum inhibitory concentrations (MIC) were estimated using the agar dilution assay. DNA sequences of the quinolone resistance-determining regions of gyrA and parC were determined for detecting the mutations found in these genes and the relations among the isolates by constructing phylogenetic trees. The results revealed that only 43 (82.7%) of isolates were P. aeruginosa, of which 31 (72.06%) were resistant to different concentrations of ciprofloxacin, ranging between 4 and >32 µg/ml. Twenty six isolates were selected for sequencing, including sensitive, intermediately resistant, and highly resistant to ciprofloxacin. The ciprofloxacin sensitive isolates did not exert any amino acid alterations in gyrA or parC genes; however, a single intermediately resistant isolate had a single mutation at each gene. Of the total resistant isolates (20), 6 isolates had no mutations at different MIC levels, While 14 isolates had Thr-83-Ile substitution in gyrA and Ser-87-Leu substitution in parC, only five isolates had a second mutation, namely Asp-87-Asn, in gyrA. The phylogenetic analysis of the studied groups showed divergence from the P. aeruginosa PAO1 and PAO1OR reference strains due to increased mutations and polymorphisms in studied isolates. In conclusion, P. aeruginosa occurrence was increased in burn infections and the fluoroquinolones in current use are not as effective as before; the main resistance mechanism in local clinical isolates of P. aeruginosa is mutations, where the main target of fluoroquinolones is gyrA gene.
A total of 54 out of 67 (80.59%) of burn wound swab showed growth of one, or two, or three bacterial pathogens. Pseudomonas aeruginosa was the commonest pathogen, isolated in 48.14% of swab samples, followed by Klebsiella pneumoniae (31.48%), Staphylococcus aureus (27.77%), Acinetobacter baumanii (14.81%), Escherichia coli (7.40%), and Citrobacter freundii, Providencia stuartii, Enterobacter cloacae, with 1.85% isolation percentage for each. All bacterial isolates were tested against 19 antibiotics, and showed multi-drug resistance to 10 antibiotics, or more. The most effective antibiotics were the fifth-generation cephalosporin, ceftobiprole, and and antibiotic combinations, as Ceftazidime / clavulanic acid, and Cefoperazone /sulbactam, an
... Show MoreSixty samples from saliva and dental plaque were selected from patients with caries active at ages from 4-65years. 22 isolates belong to Streptococcus mutans. All isolates pronounced adhesion and biofilm formation in various degrees. By using Polymerase Chain Reaction ﴾PCR﴿ Techniques, it was found that these isolates had gtfB encode GtfB with 80 bp, gtfC encode GtfC with 81 bp, and gtfD with 324 bp which explain their potential of biofilm formation.
Neonatal sepsis refers to the bacterial bloodstream infections of the newborn during the neonatal period as usually the first twenty-eight days of life. The current study was done in the laboratories of AL-Batool Teaching Hospital for Gynecology and Pediatrics in Baqubah, Diyala Governorate, including 140 blood specimens collected from the neonates admitted to the hospital with suspected sepsis, the ages of the both groups was ranged from 1 day to 28 days. Out of the total cultured samples, 32.14% (45 of 140) were positive and 67.86% (95 of 140) were negative blood culture. 45 of 140 samples were negative to the blood culture chosen as control group. The results showed highest isolates were Coagulase Negative Staphylococcus (CoNS) 19 (42.2%
... Show MoreEight isolates of P. aeruginosa were obtained out of 90 water samples. The isolated colonies were identified based on their morphology and biochemical characteristics, were confirmed as P. aeruginosa by the API 20E test system.
The percentages of P. aeruginosa recovery in this study were 8.8.% All isolates were able to produce greenish blue pigment (pyocyanin). Pyocyanin at all concentrations was significantly increased the percentage of fragmented DNA of peripheral blood lymphocyte cells compared to control , results showed that DNA fragmentation percentage was higher in concentration 50 μg/ml (70%,74.3%) at 24 hr,48hr respectively. In summary, results of recent study demonstrate that the pyocyanin, induces apoptosis of human periph
Urine specimen (253 samples) had been collected from urinary tract infections. The study showed that Proteus mirabilis was responsible for (11.85%) of the urinary tract infections. Also, the study had declared that the ratio of isolation of this bacterium from women was (7.51%) and it was higher than the ratio in both men and children which ranged (1.58%) and (2.76%) respectively. Morphological and biochemical studies had been applied to characterize this bacterium as well as other kinds of microorganisms that were isolated from urinary tract infection in this study. The study deals with typing methods such as using biotyping and typing according to Dienes phenomenon beside the succestibility to antibiotics. The results had shown that the s
... Show MorePseudomonas aeruginosa was isolated from various clinical samples included urine, sputum, stool, ear, wound & burn swabs. Detection of the ability of local isolates to produce staphylolysin enzyme was studied, on Tryptic soya agar + 0.2% (wt./vol.) of heat killed Staphylococcus. aureus at temperature 100oC. medium and the diameters of lysis zone ranged from 5-22mm, then the isolate P16 was chosen to extract staphylolysin A (LasA) and its specific activity reaches 8.59 unit /mg protein, whi1e the isolate P5 was chosen to extract staphylolysin D (LasD) where it's specific activity reaches 0.66 unit /mg protein since the two isolates were the most production of enzyme. Staphylolysin enzyme was extracted by cooling centrifugation and par
... Show MoreBackground: Globally, breast cancer is the second leading cause of death among women in Iraq. Several genetic and environmental factors are associated..
A total of 100 clinical sample from (urine, sputum and swabs of wound , burn and ear) were collected from patients in different hospitals of Baghdad during the period from December 2013 to May 2014. 15 isolates (15%) identified belong to Acinetobacter baumannii, swabs of wounds were represented in high percentage of A.baumannii isolates (40%) while percentage of other samples were variable. Susceptibility of 15 A.baumannii isolates were tested toward 16 different Antimicrobial agents, the results showed all isolates were multi drug resistant. In addition, Polymerase Chain Reaction Technique (PCR) was performed to detection the resistance genes encoding the Oxacillinases enzymes. The PCR analysis showed that the presence of insertion sequ
... Show MoreThe severity of UTI produced by E. coli is due to the expression of a wide
spectrum of virulence factors. In this study the role of E. coli virulence determinants
in the pathogenesis of UTI in urinary catheterized and non-catheterized patients has
been evaluated. The isolates were recovered from 129 patients admitted to the
hospital. Virulence genes of E. coli were detected by polymerase chain reaction
analysis for the prevalence of these virulence factors. The targeted genetic
determinants were those coding for Type 1 fimbriae, Pyelonephritis-Associated Pili
(PAP), Antigen 43 (Ag43), α-Hemolysin and Aerobactin siderophores among the
studied isolates. The prevalence of genes fimH, papC, ang43, hlyA and iutA were<
Pseudomonas aeruginosa is common gram negative rod – shaped bacterium, a species of considerable medical importance, P. aeruginosa is prototypical "multi drug resistant (MDR) Pathogen" that is recognised for its ubiquity, its intrinsically advanced antibiotic resistance mechanisms, and its associatation with serious illnesses – especially nosocomial infection such as ventilator – associated pneumonia and various sepsis syndromes. This study was conducted from March 2014 to July 2014, the patients were males and females. Total samples of 613 patients, selected from burns wards and general surgery wards, the samples were sending to teaching laboratories from the same hospital. The present study
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