Showing 15 results for Pseudomonas Aeruginosa
M Sattari, Aa Imani Fooladi, Gh Godarzi,
Volume 3, Issue 1 (4-2009)
Abstract
Abstract Background and objectives: Pseudomonas aeruginosa as an opportunistic pathogen can establish lethal infections in immunocompromised patients or those exposed to predisposing factors. This bacterium contains a single polar flagellum causing motility, chemotaxis and colonization in acute phase of infection. The flagella filament is made up of a structural protein called flagellin. This study was aimed at determining The frequency of fliC gene in Clinical Samples. Material and Methods: In this study, a pair of specific primer for types of flagellin (a, b type) was designed and by using PCR method its structural gene (fliC) was recognized and amplified in clinical strains. Results: This original primer has appropriate efficiency in diagnostic of pseudomonas aeroginosa flagellum. Our study shows that 85% of the Clinical Samples have a fliC gene. Conclusion: This method can be applied to recognizing of the motile strains, and their antigenic typing, and complete amplification of fliC sequence in order to cloning and expression of recombinant flagellin. Key words: Pseudomonas aeruginosa, flagellin, fliC, PCR
M Keshtvarz, Mh Pourmand, Shirazi, M Yousefi, S Hajikhani,
Volume 8, Issue 1 (4-2014)
Abstract
Abstract
Background and Objective: Transmission of pathogens by cosmetics is one of the major health complications. Direct contact with contaminated non-standard cosmetics can have irreparable side effects for the consumers. Thus, the evaluation of microbial contamination in cosmetic products is important. The aim of this study was to assess the microbiological contamination of one of frequently used cream.
Material and Methods: In the present study, 135 samples of a special moisturizing cream were randomly selected from pharmacies in Tehran. The microbial contamination assessment, sampling and culturing method were based on the protocol (No.3978) of Iranian Institute of Standard and Industrial Research.
Results: sixty-two (46%) out of 135 samples were contaminated. The highest and lowest contaminations observed were Pseudomonas aeruginosa and Bacillus, respectively.
Conclusion: Due to the high contamination rate of cosmetic creams, we recommend extremely monitoring and controlling these products by health centers.
Keywords: Cosmetics, Microbial Contamination, Pseudomonas Aeruginosa
T Ghelich, M Hashemi Karouei, I Gholampor Azizi,
Volume 8, Issue 2 (7-2014)
Abstract
Abstract Background and Objective: Because of increased resistance to antibiotics, side effects of chemical drugs and importance of medicinal plants, we aimed to assess the antibacterial effects of methanolic extract of the Polygonumbistorta plant on the E. coli (ATCC 15224), Ps. aeruginosa (ATCC 25619), B. subtilis (ATCC 6633) and Stap. Aureus (ATCC 25923). Material and Methods: After preparing the extract, its antibacterial effect was assessed via gel diffusion method, using disk / well diffusion methods to determine MIC and MBC Results: MIC of methanolic extract was 78 µg/ml for E. coli, 63×103 µg/ml for Pseudomonas aeruginosa, 39 µg/ml for Bacillus subtilis and 31×102 µg/ml for Staphylococcus aureus Conclusion: In spite of resistance of gram-negative bacteria to chemical agents, polygonum bistorta methanolic extract could inhibit the growth of E.coli and P. aeruginosa. Key words: Antibacterial, Bistorta, Escherichia Coli, Pseudomonas Aeruginosa
Ebrahimipour, Gh., Moradi, A, Karkhane, M, Marzban, Ar,
Volume 8, Issue 4 (1-2015)
Abstract
Abstract Bachground and Objective: most of environmental microorganisms have the genes resistance to antibiotics and metals. The aim of the current study was to survey resistance pattern to some antibiotics and heavy metals in three pseudomonas aeruginosa isolated from different ecological areas. Material and Methods: first, the isolates were identified by biochemical methods and phylogenetic analysis. Then, the evaluation of antibiotic resistance was conducted by disc diffusion and that of Heavy metal resistant by agar dilution, in a range of 50-500 µg/ml. Results: The results showed that all three isolates were resistant to beta lactam antibiotics. Although these isolates were highly resistant to heavy metals, no relationship was observed between ecological sources and the resistance pattern in ICT1 and Abt2 strains. However, strain Q isolated from digestive system of ParmacellaIberica showed high resistance to antibiotics and low resistance to heavy metals. Conclusion: given that environmental bacteria have a high potentiality for carrying resistance genes and this can be an advantage environmentally, they could be used to remove heavy metals from polluted areas. On the other hand, resistance genes medically are a concern due to probability of transferring to pathogen strains. Keywords: Antibiotic Resistance, Heavy Metal Resistance, Pseudomonas Aeruginosa
Soltan Dallal, Mm, Rahbar, M, Douraghi, M, Rahimi Forooshani, A, Khan Babaei, Gt, Mobarhan, M, Ghasemi, F,
Volume 8, Issue 5 (1-2015)
Abstract
Abstract
Background and Objective: Cystic fibrosis (CF) is an autosomal recessive genetic disease and Pseudomonas aeruginosa is one of the most common bacteria colonized in CF patients. Growing resistance of this bacterium to antibiotics now a day is a challenge of controlling infection in CF patient. In this study colonization of CF patients with Pseudomonas aeruginosa and antibiotic susceptibility pattern of isolated strains were examined.
Material and Methods: From 100 CF patients, during a year, sputum and bronchial swabs were collected. After culturing the samples, some of them were reported as Pseudomonas aeruginosa using biochemical tests. Mucoid strains of Pseudomonas aeruginosa were identified the same as non-producing alginate strains while for catching single pure colony, repeated passage was used. For determining antibiotic resistance of Pseudomonas aeruginosa to some antimicrobial agents Kirby-Bauer method based on CLSI was used.
Results: Of 100 samples, 40 (40%) were positive for Pseudompnas aeruginosa. The prevalence of P. aeruginosa was 23.8, 36.84 and 80% at the age of 1-3, 4-12 and 13, respectively.
Conclusion: Statistically, there is a significant difference between age and contracting with Pseudomonas aeruginosa in that the higher the age the more colonization with Pseudomonas aeruginosa.
Key words: Pseudomonas Aeruginosa, Cystic Fibrosis, Drug Resistance
Shafiee, F, Khosravi, Ad, Azarpira, S, Babaie Barkalaie, A, Abbasi Montazeri, E,
Volume 9, Issue 3 (9-2015)
Abstract
Background and Objectives: Pseudomonas aeruginosa is the most common organism, which is separated from the burn infections. Due to increased antibiotic resistance, there are many problems to deal with the infections caused by Pseudomonas aeruginosa. This study aimed to determine the resistance to antibiotics against clinical isolates of Pseudomonas using phenotype methods.
Material and Methods: 100 strains of Pseudomonas aeruginosa were collected from the burn patients in Taleghani hospital in Ahwaz, Iran, during a six-month period. After phenotypically initial identification, antibiotic sensitivity of isolated strains to conventional antibiotics against Pseudomonas aeruginosa was determined using a disk diffusion technique, and Phenotypic screening for MBLs production was performed.
Results: the maximum percentage was related to wound infection and the frequencies of the resistance to imipenem, meropenem, piperacillin, piperacillin-tazobactam, ceftazidime, gentamicin, amikacin, and ciprofloxacin, doripenem, ertapenem and colistin sulphate, were 70%, 53%, 83%, 67%, 91%, 88%, 84%, 84%, 33%, 90%, and 0%, respectively. The use of CD Test methods was approved for determining resistance to Carbapenems.
Conclusion: antibiotic resistance to Pseudomonas aeruginosa is increasing and colistin sulphate is the most effective antibiotic.
Keywords: Pseudomonas Aeruginosa; Burn Infection; Antibiotic Resistance.
Azizollah Ebrahimi Kahrizsangi , Saied Habibian Dehkordi , Ziba Shabanpur, Reza Hakimi Alni , Majid Hemati,
Volume 10, Issue 6 (11-2016)
Abstract
ABSTRACT
Background and Objective: Biofilms are community of bacteria that attach to inanimate surfaces or living tissues via production of extracellular polymers and exopolysaccharide matrix. Microbial biofilms on various surfaces of the hospital environment are considered as a reservoir of infection spread. The present study aimed to evaluate the disinfecting effect of benzalkonium chloride on some bacterial isolates causing nosocomial infections.
Methods: First, 13 isolates from four bacteria including Pseudomonas aeruginosa, Staphylococcus aureus, Acinetobacter and Enterobacter were obtained from Microbiology Laboratory of Al-Zahra Hospital in Isfahan, Iran. The samples were transferred to Microbiology Laboratory of Faculty of Veterinary Medicine of Shahrekord University for testing. Evaluation of biofilm formation and determination of minimum inhibitory concentration (MIC) of the disinfectant and effect of the disinfectant on planktonic growth and biofilm formation were performed.
Results: All bacterial isolates (52 cases) produced biofilm. Mean MIC of benzalkonium chloride for P. aeruginosa, S. aureus, Enterobacter and Acinetobacter was 0.14, 0.2, 0.18, 0.17 g/ml, respectively. Planktonic growth of all four bacteria was inhibited at concentrations of 2MIC, MIC and 1/2MIC. Biofilm was not produced in MIC and 2MIC concentrations, and biofilm formation capability increased by reducing the concentration of benzalkonium chloride.
Conclusion: The results show that the use of appropriate concentration of benzalkonium chloride can prevent the growth of different bacterial species, but sub-MIC dose of this disinfectant may stimulate biofilm formation.
Keywords: Biofilm, Benzalkonium Chloride, Pseudomonas Aeruginosa, Staphylococcus Aureus, Enterobacter, Acinetobacter.
Mina Parsa , Malahat Ahmadi , Habib Dastmalchi , Aliasghar Tehrani ,
Volume 11, Issue 6 (11-2017)
Abstract
ABSTRACT
Background and Objectives: Nowadays, the prevalence of multidrug-resistant pathogens such as
Pseudomonas aeruginosa is increasing worldwide. Many studies have been seeking new treatment strategies to treat infections caused by these microorganisms. Silver nanoparticles (AgNPs) along with L-arginine have significant antimicrobial effects and could be used as alternatives for ineffective drugs.
Methods: In this study, the antibacterial activity of AgNPs, L-arginine and various concentrations of AgNPs along with L-arginine (12.5 and 25 mg/ml) were investigated against
P. aeruginosa PAO1 using the broth macrodilution method.
Results: Minimum inhibitory concentration of AgNPs, L-arginine and AgNPs combined with 25 and 12.5 mg/ml L-arginine was 15.6 μg/ml, 25 mg/ml, 1.9 μg/ml and 3.9 μg/ml, respectively. Minimum bactericidal concentration of AgNPs, L-arginine and AgNPs combined with 25 and 12.5 mg/ml L-arginine was 31.2 μg/ml, 50 mg/ml, 3.9 μg/ml and 7.8 μg/ml, respectively.
Conclusion: Our study suggests that AgNPs along with L-arginine can be used as an alternative antibacterial agent against
P. aeruginosa, and might be useful for treatment of wound infections.
Keywords: Nanoparticles, Arginine,
Anti-Bacterial Agents,
Pseudomonas aeruginosa.
Hamid Vaez , Vahid Vaez , Farzad Khademi ,
Volume 11, Issue 6 (11-2017)
Abstract
ABSTRACT
Background and Objectives: Pseudomonas aeruginosa is an important non-fermenting gram-negative hospital-acquired pathogen. Treatment of P. aeruginosa infections has become more challenging due to overexpression of efflux pumps. The aim of the present study was to apply in silico analysis to evaluate the structure of the efflux pump regulatory protein, MexR, and impact of mutation on its stability and function.
Methods: Different bioinformatics tools including EXPASY, PROTEER, TECCOFFE, iStable, I-Mutant 2, STRING, ESPript, GOR IV, and PDB were used in the study.
Results: Aliphatic and instability indices were 104.15, and 46.52, respectively, indicating that the protein has a relatively short half-life. Most mutations decreased protein stability. Twenty-four mutations were identified as deleterious, with negative impact on the protein’s function.
Conclusion: Determination of structure, variability, and function of MexR could be useful for modeling of treatment and control of multidrug resistant P. aeruginosa, with overexpressed efflux pump. We found that MexR is a relatively unstable and conserved protein and the majority of mutations decrease its stability.
Keywords: Pseudomonas aeruginosa, MexR protein, Drug resistance, drug resistance multiple.
Majid Komijani, Khashayar Shahin, Mohadeseh Barazandeh, Mehdi Sajadi,
Volume 12, Issue 5 (9-2018)
Abstract
ABSTRACT
Background and Objectives: Pseudomonas aeruginosa is an opportunistic pathogen resistant to various antibiotics. The aim of the present study was to study resistant patterns in clinical isolates of
P. aeruginosa, classify them into pandrug resistance (PDR), extensive drug resistance (XDR) and multidrug resistance (MDR) groups, and identify extended-spectrum β-lactamase (ESBL)-positive isolates using the phenotypic and genotypic methods.
Methods: This cross-sectional study was conducted on 161
P. aeruginosa isolates collected from the city of Isfahan, Iran. Antibiotic susceptibility tests were performed using 11 antimicrobial agents. ESBL-positive strains were identified using the phenotypic and genotypic methods.
Results: The highest level of antibiotic resistance was observed against ceftazidime (77.64%). None of the isolates was resistant to polymyxin B. In the phenotypic method, 64 isolates (39.75%) were found as ESLB-positive, whereas 132 isolates (81.98%) were ESBL-positive in the genotypic method. The number of ESBL-positive isolates in the genotypic method was significantly higher than in the phenotypic method. The frequency of XDR and MDR isolates was 50.93% and 27.32%, respectively. None of the isolates was PDR. The frequency of the
blaTEM gene was significantly higher than other genes (P<0.0001).
Conclusion: It was revealed that the genotypic method was much more accurate in identifying ESBL-positive strains than the phenotypic method. Therefore, use of the molecular method may increase the chance of successful treatment with antibiotics of the β-lactam family.
Keywords: Drug Resistance,
β-lactamases,
Pseudomonas aeruginosa.
Maryam Meskini , Azad Khaledi , Davoud Esmaeili ,
Volume 13, Issue 1 (1-2019)
Abstract
ABSTRACT
Background and Objectives: Pseudomonas aeruginosa is a gram negative opportunistic pathogen and an important cause of wound infections and nosocomial infections. The purpose of this study was to study inhibitory effects of a new ointment prepared from medicinal plants against P. aeruginosa isolates.
Methods: In this study, an ointment called ZOUSH was prepared from mixing alcoholic extracts of Satureja khuzestaniea, Zataria multiflora, Mentha mozaffariani Jamzad, honey and polyurethane. Minimal inhibitory concentration of ZOUSH and its compositions alone or combined was determined using the disk diffusion method.
Results: S. khuzestaniea, Z. multiflora and Mentha mozaffariani Jamzad had inhibitory effects against P. aeruginosa. The ZOUSH ointment had greater antibacterial effects than the any of its compositions used solely or combined. The diameter of inhibition zone had a direct relationship with the concentration of the extracts. Moreover, the antibacterial effect of the ZOUSH ointment was identical to that of polymyxine B (300 µg).
Conclusion: We demonstrated that the ZOUSH ointment has inhibitory effects against P. aerugionosa. The inhibition zone diameter is directly correlated with the concentration of the extracts. Our results suggest that the ointment could be useful for treatment of burn wounds and skin infections.
Mohammad Habibi Juybari , Hamidreza Pordeli , Saeid Mikaeili ,
Volume 13, Issue 3 (5-2019)
Abstract
ABSTRACT
Background and Objectives: Schiff base ligands are prepared via the condensation reaction of 1, 10- dimethyl–phenantroline aldehyde derivative with some nitrogen donor ligands, such as benzene ring that have different functional groups (-OH, -SH, -OCH3,-CH2OH, -Br) in acetonitrile. Recent studies suggest that Schiff bases might have antibacterial activity. Therefore, we aimed to synthesize new Schiff base complexes and evaluate their antibacterial activity against a number of Gram-positive and Gram-negative bacteria.
Methods: Schiff base ligands and their complexes were characterized by mass spectrometry, infrared spectroscopy and nuclear magnetic resonance spectroscopy. The in vitro antibacterial activity of the Schiff base ligands and metal ions against Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa was evaluated by determining minimum inhibitory concentration (MIC) and minimal bactericidal concentration (MBC) using the broth dilution method.
Results: All synthesized Schiff bases exhibited favorable antibacterial activity against the tested microorganism, but the antibacterial effect of compounds 3OH and 3SH was more significant than that of other compounds.
Conclusion: Compound 3EOH has favorable antibacterial activity against the tested bacteria.
Keywords: Schiff bases, antibacterial effect, Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa.
Seyed Amin Enayatzadeh Meymandi, Laleh Babaeekhou, Maryam Ghane,
Volume 13, Issue 5 (9-2019)
Abstract
ABSTRACT
Background and Objectives: Emergence and spread of multidrug-resistant (MDR) and extensively-drug resistant (XDR) Pseudomonas aeruginosa strains could complicate antipseudomonal chemotherapy. Dissemination of resistance genes, such as β-lactamases encoding genes by horizontal gene transfer can lead to development of multi-drug resistance in P. aeruginosa. The purpose of this study was to investigate the latest resistance patterns in MDR and XDR strains and evaluate Ambler class A β-lactamase gene distribution in P. aeruginosa clinical isolates.
Methods: One hundred molecularly and biochemically identified P. aeruginosa strains isolated from different clinical specimens were tested for sensitivity to 17 antibiotics using the Kirby-Bauer disk diffusion method. PCR was performed to detect bla TEM-1, bla SHV-1, bla REP-1 and bla VEB-1 genes. Results were analyzed using SPSS and NTSYSpc softwares.
Results: Based on the results of antibiogram, the highest rate of resistance was observed against amikacin (100%), aztreonam (83%), ceftazidime (55%), cefepime (55%) and netilmicin (48%). In addition, the frequency of MDR and XDR isolates was 95% and 5%, respectively. The blaSHV-1, bla TEM-1, bla PER-1 and bla VEB-1 genes were detected in 31%, 24%, 13% and 10% of the isolates, respectively.
Conclusion: Antibiotic resistance to β-lactam antibiotics and frequency of β-lactamase genes were relatively high in the study area. We also found that a significant proportion of XDR strains with different antibiotic resistance profile is isolated from tracheal specimens.
KEYWORDS: Pseudomonas aeruginosa, Beta-Lactamase, Multidrug Resistant, Extensively Drug Resistant.
Mehrdad Rezaeian, Saeid Khanzadi, Mohammad Hashemi, Mohammad Azizzadeh,
Volume 15, Issue 3 (5-2021)
Abstract
Background and objectives: Chitosan is a preservative that is commonly used in food packaging due to forming a film with antimicrobial activity. Many antimicrobial agents have been used to control the growth of different bacteria, fungi and yeasts in food products using chitosan coating. The present research was conducted to examine inhibitory effects of a coating incorporated with the essential oils of Zataria multiflora (ZEO) and Bunium persicum (BEO) on the growth of Pseudomonas artificially inoculated onto salmon fillets over a period of 12 days at 4 °C.
Methods: The antibacterial activity of BEO against P. aeruginosa was evaluated using the microdilution method via determining minimum inhibitory concentration and minimum bactericidal concentration. For the food model investigation, three P. aeruginosa strains were inoculated onto trout fillets as culture cocktail to assess their survival over 12 days of storage.
Results: The results indicated that ZEO and BEO had stronger inhibitory effect on P. aeruginosa in trout fillets when applied along with gel type nano-emulsion of chitosan solution. The separate use of each of these substances also significantly inhibited the growth of these pathogenic bacteria compared with the control. In addition, the use of chitosan coating without any antimicrobial agent affected the growth of P. aeruginosa.
Conclusion: The gel type nano-emulsion of chitosan coating containing ZEO and BEO can be applied on foodstuff, particularly fish and its products, as an antimicrobial agent.
Mohammad Hassan Jokar, Fatemeh Mohamadkhani, Maliheh Moradzadeh, Samira Beygi, Ashraf Mohamadkhani,
Volume 16, Issue 2 (3-2022)
Abstract
Background and objectives: Recycled polyethylene terephthalate (RPET) nanofibers have become an important part of human life, with a continuous increase in their production and consumption. Herein, the antibacterial activity of nickel nanoparticles/recycled polyethylene terephthalate nanofibers (NiNP/RPET NF web) was evaluated by analyzing alginate expression in Pseudomonas aeruginosa, as an opportunistic microorganism.
Methods: NiNPs were synthesized and NiNP/RPET NF was produced by adding 25 μg/ml of NiNP to 10% solutions of RPET at a weight ratio of 3%. After exposing P. aeruginosa (PA01) to NiNP/RPET NF, the biofilm-forming capacity was determined and real-time PCR was performed to measure algD expression.
Results: Treatment with 25 μg/ml of NiNP/RPET NF reduced growth of P. aeruginosa on Mueller Hinton agar but did not result in complete inhibition. The biofilm optical density (550 nm) was 0.464 ± 0.021 after treatment with NiNP/RPET NF and 0.082± 0.011 in the absence of NiNP/RPET NF. This indicates the significant reduction of biofilm formation after exposure to NiNP/RPET NF (p=0.01). In addition, a 0.6-fold (p=0.03) reduction in alginate expression was detected by real-time quantitative real-time PCR.
Conclusion: Our results indicate the potential of NiNP/RPET NF for application in nano-based antibacterial medical systems.
