COMPARISON OF ANTIBIOTIC SUSCEPTIBILITIES OF CARBAPENEM RESISTANT AND CARBAPENEMSUSCEPTIBLE PSEUDOMONAS AERUGINOSA STRAINS AND INVESTIGATING SOME CARBAPENEMASE GENES IN CARBAPENEM RESISTANT STRAINS

The aim of this study was to determine the characteristics of carbapenem-resistant Pseudomonas aeruginosa (P. aeruginosa) strains and 5-year changes in resistance in a tertiary university hospital. Material and Methods. The study included 90 and 101 randomly selected P. aeruginosa strains serotyped in 2003 and 2008, respectively. The standardized disk diffusion test and E-test were used to determine resistance to antibiotics. P. aeruginosa strains were considered to have high-level resistance if a minimum inhibitory concentration (MIC) for imipenem or meropenem was >32 μg/mL. To identify serogroups, sera containing specific antibodies against O group antigens of P. aeruginosa were used. P. aeruginosa isolates resistant to imipenem or/and meropenem were screened for metallo-β-lactamase (MBL) production by using the MBL E-test. Results. Comparison of the changes in resistance of P. aeruginosa strains to carbapenems within the 5-year period revealed that the level of resistance to imipenem increased. In 2003, 53.3% of P. aeruginosa strains were found to be highly resistant to imipenem, while in 2008, this percentage increased to 87.8% (P=0.01). The prevalence of MBL-producing strains increased from 15.8% in 2003 to 61.9% in 2008 (P<0.001). In 2003 and 2008, carbapenem-resistant P. aeruginosa strains were more often resistant to ciprofloxacin and gentamicin than carbapenem-sensitive strains. In 2008, carbapenem- resistant strains additionally were more often resistant to ceftazidime, cefepime, aztreonam, piperacillin, and amikacin than carbapenem-sensitive strains. MBL-producing P. aeruginosa strains belonged more often to the O:11 serogroup than MBL-non-producing strains (51.7% vs. 34.3%, P<0.05). A greater percentage of non-MBL-producing strains had low MICs against ciprofloxacin and amikacin as compared with MBL-producing strains. Conclusions. The results of our study emphasize the need to restrict the spread of O:11 serogroup P. aeruginosa strains and usage of carbapenems to treat infections with P. aeruginosa in the intensive care units of our hospital

Download Full-text

Biofilm formation and serum susceptibility in Pseudomonas aeruginosa

Open Medicine ◽

10.2478/s11536-013-0241-y ◽

2014 ◽

Vol 9 (2) ◽

pp. 187-192 ◽

Cited By ~ 1

Author(s):

Greta Mikucionyte ◽

Asta Dambrauskiene ◽

Erika Skrodeniene ◽

Astra Vitkauskiene

Keyword(s):

Pseudomonas Aeruginosa ◽

Respiratory Tract ◽

Biofilm Formation ◽

Clinical Samples ◽

Opportunistic Pathogens ◽

Carbapenem Resistant ◽

Biofilm Production ◽

Significant Difference ◽

Resistant Strains ◽

Different Sources

AbstractPseudomonas aeruginosa (P. aeruginosa) is one of the most important opportunistic pathogens. The pathogenicity of P. aeruginosa has been associated with multiple bacterial virulence factors. The aim of this study was to evaluate the association between P. aeruginosa strains obtained from various clinical samples and resistance to antibiotics and pathogenicity factors, such as resistance to serum bactericidal activity and biofilm formation. This study included 121 P. aeruginosa strains isolated from clinical samples; 65 of the isolated P. aeruginosa strains were carbapenem-resistant, and 56 were carbapenem-sensitive. Carbapenem-resistant P. aeruginosa strains were more often resistant to the majority of tested antibiotics, compared to carbapenem-sensitive strains. We did not find any statistically significant difference between resistance to carbapenems and serum resistance and ability of tested P. aeruginosa strains to produce biofilms. Carbapenem-resistant P. aeruginosa strains were recovered from the urinary tract significantly more often (75.0%) than carbapenem-sensitive P. aeruginosa strains (25.0%). Carbapenem-sensitive P. aeruginosa strains were recovered significantly more often from the respiratory tract than carbapenem-resistant strains, 60.0% and 40.0%, respectively. All the P. aeruginosa strains recovered from blood were serum-resistant. P. aeruginosa strains recovered from the respiratory tract and wounds were significantly frequently serum sensitive, 95.6% and 56.6%, respectively. We did not find any differences in biofilm production among the P. aeruginosa strains recovered from different sources.

Download Full-text

Carbapenem resistance in non-fermentative bacterial species and in Enterobacteriaceae isolates from hospitalized patients in different health-care settings

Medicine and Pharmacy Reports ◽

10.15386/cjmed-282 ◽

2014 ◽

Vol 87 (4) ◽

pp. 235-241

Author(s):

Mihaela Ileana Ionescu ◽

Dan Stefan Neagoe ◽

Claudia Chiorean ◽

Loredana Dumitras ◽

Aurelia Rus

Keyword(s):

Health Care ◽

Pseudomonas Aeruginosa ◽

Intensive Care ◽

Intensive Care Units ◽

Carbapenem Resistance ◽

Hospitalized Patients ◽

Health Care Settings ◽

Carbapenem Resistant ◽

Acinetobacter Spp ◽

Resistant Strains

Aim. Carbapenem-resistant strains have been increasingly reported over the last few years. In this study we used laboratory records to determine the occurrence of carbapenem-resistant strains from hospitalized patients with emphasis on the comparative analysis of the incidence in various health-care settings. Materials and methods. From January 2012 to November 2012 and from May 2013 to November 2013, we evaluated 566 strains (Acinetobacter spp., Pseudomonas aeruginosa, Escherichia coli, and Klebsiella spp.). All isolates were tested and analyzed according to their antibiotic resistance phenotypic pattern. Laboratory results were correlated with data regarding admission in different clinical wards.Results. Among 566 isolates, 191 carbapenem-resistant or carbapenem-intermediate strains (33.74%) were detected. Non-fermentative species were the most prevalent carbapenem-resistant organisms, 80.62% of 191 carbapenem-resistant or carbapenem-intermediate strains isolated were Acinetobacter spp., and 17.27% of 191 were Pseudomonas aeruginosa. Apart from that, only 4 (2.09%) carbapenem-resistant Enterobacteriaceae (CRE) strains were identified. We identified 59.30% of 172 strains isolated from patients hospitalized in anesthesia and intensive care units non-susceptible to carbapenems. The main mechanism associated with carbapenem resistance could be the production of carbapenemase in combination with impermeability.Conclusions. Our study demonstrates that infections with carbapenem-resistant strains are correlated with hospitalization in intensive care units. Our data showed a predominant carbapenem-resistant Acinetobacter spp. strain in intensive care units.

Download Full-text

The most common bacterial isolates from wound samples – a three-year study

Archives of Public Health ◽

10.3889/aph.2021.5736 ◽

2021 ◽

Vol 13 (1) ◽

pp. 77-90

Author(s):

Ana Kaftandzieva ◽

Marko Kostovski ◽

Blerta Mehmeti ◽

Gordana Mirchevska

Keyword(s):

Pseudomonas Aeruginosa ◽

Anaerobic Bacteria ◽

Resistant Bacteria ◽

Klebsiella Pneumonia ◽

City Hospital ◽

E Coli ◽

Percentage Decrease ◽

Carbapenem Resistant ◽

Resistant Strains ◽

The University

Aim: The aim of our study was to determine the most common bacteria isolated from wound samples and tо compare the frequency of the resistant bacteria isolated over a 3-year period. Material and methods: During a three years period (2017-2019) a total of 11 863 wound samples (wound swabs, punctuates, exudates, tissue, etc.) were obtained from the hospitalized patients in the University Clinics of the ,,Mother Theresa” campus, the City hospital ,,8th September” and the University Clinic for surgical diseases ,,St. Naum Ohridski” in Skopje. All samples were processed at the Institute of Microbiology and Parasitology, Faculty of Medicine, Skopje. They were examined by standard microbiology techniques. Identification and susceptibility of microorganisms were done by both standard methods and automatized Vitek 2 system. Results: Out of a total number of samples, which was 3 463 in 2017, 4 127 in 2018 and 4 273 in 2019, positive were 2 068 (60%), 2 302 (55.8%) and 2 387 (55.9%), respectively. From the total of aerobes/facultative anaerobes (2 758, 2 949 and 3 279 in three consecutive years, 2017, 2018 and 2019, respectively), Staphylococcus aureus was the most predominant isolate (19.5%, 16.6%, 16.9%) followed by Enterococcus spp (16%, 16%, 16.7%), Pseudomonas aeruginosa (12%, 13%, 12.7%) and E. coli (10%, 10.4%, 10.7%). Considering anaerobic bacteria, the percentage of Gram positive anaerobes (Peptostreptococcus) has decreased from 33% to 18% out of a total number of anaerobes, unlike Gram negative anaerobes in which the increasing percentage was mostly observed in bacteria of the genus Bacteroides (from 39% to 45%). The percentage of the resistant strains of MRSA, CNS-MR and VRE was almost the same in that period. In Gram-negatives the percentage of ESBL-positive isolates of E. coli and Enterobacter spp. increased consecutively from 2017 to 2019. The increase in the percentage of resistant strains was more noticeable in ESBL-positive isolates of Klebsiella pneumonia between 2017 and 2018, but in 2019 a percentage decrease can be observed. Considering carbapenem-resistant (CR) Enterobacterales, an increase in the resistance was noticeable in K. pneumonia. The increase in the percentage of resistant strains in Enterobacter spp. between 2017 and 2018, as well as the decrease between 2018 and 2019 was statistically significant. The percentage of CR-isolates of Pseudomonas aeruginosa was from 30% to 38% and for Acinetobacter spp. this percentage was from 81% to 85%. Conclusion: The knowledge of the most commonly isolated bacterial pathogens, especially the presence of resistant bacteria, is crucial and should be continuously monitored in order to understand, construct and update effective treatment algorithms and guidelines.

Download Full-text

Molecular Analysis of Carbapenem-resistant Strains of Pseudomonas aeruginosa Isolated From Patients Hospitalized in Various Transplantation Wards Between 2008 and 2011

Transplantation Proceedings ◽

10.1016/j.transproceed.2014.08.027 ◽

2014 ◽

Vol 46 (8) ◽

pp. 2576-2578 ◽

Cited By ~ 2

Author(s):

E. Kosykowska ◽

K. Szymanek-Majchrzak ◽

S. Walter de Walthoffen ◽

R. Izdebski ◽

A. Mlynarczyk ◽

...

Keyword(s):

Pseudomonas Aeruginosa ◽

Molecular Analysis ◽

Carbapenem Resistant ◽

Resistant Strains

Download Full-text

It’s Not Easy Being Green: A Narrative Review on the Microbiology, Virulence and Therapeutic Prospects of Multidrug-Resistant Pseudomonas aeruginosa

Antibiotics ◽

10.3390/antibiotics10010042 ◽

2021 ◽

Vol 10 (1) ◽

pp. 42

Author(s):

Payam Behzadi ◽

Zoltán Baráth ◽

Márió Gajdács

Keyword(s):

Pseudomonas Aeruginosa ◽

Excess Mortality ◽

Review Paper ◽

Acquired Resistance ◽

Multidrug Resistant ◽

Resistance Mechanisms ◽

Gram Negative Bacteria ◽

Pathogenic Role ◽

Carbapenem Resistant ◽

Resistant Strains

Pseudomonas aeruginosa is the most frequent cause of infection among non-fermenting Gram-negative bacteria, predominantly affecting immunocompromised patients, but its pathogenic role should not be disregarded in immunocompetent patients. These pathogens present a concerning therapeutic challenge to clinicians, both in community and in hospital settings, due to their increasing prevalence of resistance, and this may lead to prolonged therapy, sequelae, and excess mortality in the affected patient population. The resistance mechanisms of P. aeruginosa may be classified into intrinsic and acquired resistance mechanisms. These mechanisms lead to occurrence of resistant strains against important antibiotics—relevant in the treatment of P. aeruginosa infections—such as β-lactams, quinolones, aminoglycosides, and colistin. The occurrence of a specific resistotype of P. aeruginosa, namely the emergence of carbapenem-resistant but cephalosporin-susceptible (Car-R/Ceph-S) strains, has received substantial attention from clinical microbiologists and infection control specialists; nevertheless, the available literature on this topic is still scarce. The aim of this present review paper is to provide a concise summary on the adaptability, virulence, and antibiotic resistance of P. aeruginosa to a readership of basic scientists and clinicians.

Download Full-text

Nosocomial infections causedby Pseudomonas aeruginosa in cancer clinics

Siberian Journal of Oncology ◽

10.21294/1814-4861-2019-18-2-28-34 ◽

2019 ◽

Vol 18 (2) ◽

pp. 28-34 ◽

Cited By ~ 2

Author(s):

N. V. Dmitrieva ◽

M. V. Eidelshtein ◽

V. V. Aginova ◽

I. N. Perukhova ◽

Z. V. Grigorievskaya ◽

...

Keyword(s):

Pseudomonas Aeruginosa ◽

Cancer Patients ◽

Nosocomial Infections ◽

Clinical Samples ◽

Beta Lactamase ◽

Mechanisms Of Resistance ◽

Carbapenem Resistant ◽

Resistant Strains

The purpose of the study was to evaluate the frequency of isolation of multi-resistant Pseudomonas aeruginosa and identify the mechanisms of resistance to carbapenems.Material and methods. We analyzed 866 strains of Pseudomonos aeruginosaisolated from clinical samples from cancer patients in the period 2014–2016. the level of resistance to piperacillin/tazobactam, ceftazidime, cefepime, imipenem, meropenem, ciprofloxacin, amikacin in dynamics was determined. carbapenem-resistant (car-R) strains were examined for the presence of enzymes.Results. Between 2014 and 2016, the number of strains resistant to piperacillin/tazobactam was 20.1–12.9 %, to ceftazidime – 33.0–32.9 %, to cefepime – 25.6–32.9 %, ciprofloxacin – 36.8–43.8 %, amikacin – 23.8–24.9 %. No statistically significant differences were found (p>0.05). However, an increase in the number of car-R strains from 31.7 to 43.8 % was observed (p<0.05). of 7 strains of P. aeruginosainvestigated for the presence of acquired carbapenemases, the production of metal-beta-lactamase of group Vimwas detected in 2 strains, and class acarbapenemases of the gEs-5 group in one strain.Conclusion. P. aeruginosaresistance to all antibiotic groups did not exceed 50 % and remained almost unchanged for 3 years, with the exception of the increase in car-R strains. three out of 7 (42.9 %) carbapenem-resistant strains were genetically stable.

Download Full-text

Discarded old antibiotics as a new arsenal for multi-resistant isolates in diabetic foot ulcer infections: Therapeutic value of parenteral Colistin versus multi-resistant Pseudomonas speciesisolate strains. Case Report

10.21203/rs.3.rs-702608/v1 ◽

2021 ◽

Author(s):

Ahmed Shabhay ◽

Jaffu O. Chilongola ◽

Stephen Mshana ◽

Zarina Shabhay ◽

Jeff Van Baal ◽

...

Keyword(s):

Pseudomonas Aeruginosa ◽

Renal Impairment ◽

Lower Limb ◽

Main Pulmonary Artery ◽

Lower Lobe ◽

Lower Limbs ◽

Carbapenem Resistant ◽

Left Lower Limb ◽

Resistant Strains ◽

Novel Antibiotics

Abstract Background Antimicrobial resistance to current novel antibiotics is posing a major threat to both human and zoonotic life. This poses a serious potential of rolling back to pre-antibiotic era clinical settings. Antimicrobial discovery pipeline has dried up as major pharmaceutical brands have shifted to long term chronic illness drugs production. In the absence of new novel antibiotics molecules, clinicians have resorted into a desperate last resort to review and re-introduce prior discarded antibiotics as their new weaponry in the fight against multi-resistant Gram-negative bacteria. Case presentation: We report a case of a 77 years old bed ridden diabetic and hypertensive with renal impairment diagnosed with bilateral lower limbs wet gangrene. She underwent transfemoral on her right and transtibial amputation on her left lower limb. She developed Surgical site infection on her right stump and wet gangrene on her left stump. Surgical toilet, debridement and stump revision was done on her right stump and a transfemoral amputation on her left lower limb. Pus swab on her right stump revealed carbapenem resistant strains of Pseudomonas aeruginosa. She was instituted on parenteral colistin and showed no bacterial growth 7 days post treatment. She suffered an ischaemic cerebral vaso-occlusive stroke during her hospital stay. CT angiography revealed distal infra-renal abdominal aorta multiple calcified plaques, multiple calcified plaques and completely obstructing thrombus both on common and external iliac arteries, seen downstream to both superficial femoral arteries with multiple collaterals in both thighs. The included portion of the lower lung fields showed a large filling defect in the right main pulmonary artery extending to the lower lobe branches suggestive of right-sided pulmonary embolism. She developed hypostatic pneumonia, bed sores and her condition deteriorated and she unfortunately succumbed from her comorbidities. Despite our patient succumbing to her multiple co-morbidities we report this case to highlight the isolation of carbapenem resistant strains of Pseudomonas aeruginosa and the efficacy and safety of colistin as a salvage antibiotic in renal impaired patients. Conclusions Colistin can be safely used as a last reserve antibiotic for multi-resistant strains of Pseudomonas aeruginosa infection even in patients with renal impairment.

Download Full-text

Ceftolozane/Tazobactam-Induced Leukocytosis and Clinical Failure in a Patient Being Treated for Ventilator-Associated Pneumonia Caused by Carbapenem-Resistant Pseudomonas aeruginosa: a Case Report

SN Comprehensive Clinical Medicine ◽

10.1007/s42399-021-00750-5 ◽

2021 ◽

Vol 3 (2) ◽

pp. 701-704

Author(s):

Bejoy P. Maniara ◽

Ian Wells

Keyword(s):

Pseudomonas Aeruginosa ◽

Case Report ◽

Ventilator Associated Pneumonia ◽

Clinical Failure ◽

Carbapenem Resistant

Download Full-text

Prevalence of metallo-β-lactamase genes among Pseudomonas aeruginosa isolated from various clinical samples in China

Journal of Laboratory Medicine ◽

10.1515/labmed-2019-0162 ◽

2020 ◽

Vol 0 (0) ◽

Author(s):

Wei Wang ◽

Xiaoya Wang

Keyword(s):

Pseudomonas Aeruginosa ◽

Antibiotic Susceptibility ◽

Ethylenediaminetetraacetic Acid ◽

Carbapenem Resistance ◽

Opportunistic Pathogen ◽

Detection Methods ◽

Clinical Samples ◽

Routine Practice ◽

Carbapenem Resistant ◽

High Prevalence

AbstractBackgroundPseudomonas aeruginosa is an opportunistic pathogen which is associated with nosocomial infections and causes various diseases including urinary tract infection, pneumonia, soft-tissue infection and sepsis. The emergence of P. aeruginosa-acquired metallo-β-lactamase (MBL) is most worrisome and poses a serious threat during treatment and infection control. The objective of this study was to identify antibiotic susceptibility, phenotypic detection of MBL production and to determine the prevalence of MBL genes in carbapenem-resistant P. aeruginosa isolated from different clinical samples.MethodsA total of 329 non-duplicate P. aeruginosa isolated from various clinical samples from two hospitals in China between September 2017 and March 2019 were included in this study. Phenotypic detection of MBL was performed by the combined detection method using imipenem and imipenem-ethylenediaminetetraacetic acid (EDTA) discs. MBL-encoding genes including blaVIM-1, blaVIM-2, blaIMP-1, blaIMP-2, blaSPM-1, blaSIM, blaNDM-1 and blaGIM were detected by polymerase chain reaction (PCR).ResultsOf the 329 P. aeruginosa, majority of the isolates were resistant to imipenem (77.5%) followed by meropenem (64.7%). Of the 270 P. aeruginosa isolates tested, 149 (55.2%) isolates were found to be positive for MBL detection. Of the different samples, 57.8% (n = 26) of P. aeruginosa isolated from blood were found to be positive for MBL production. Of the various MBL genes, blaIMP-1 (28.2%) was the most predominant gene detected followed by blaVIM-2 (18.8%), blaVIM-1 (16.1%), blaNDM-1 (9.4%), blaIMP-2 (6.7%), blaSIM (6.0%), blaSPM-1 (4.0%) and blaGIM (1.3%) genes.ConclusionsThe high resistance of P. aeruginosa toward imipenem and meropenem and the high prevalence of blaIMP-1 and blaVIM-2 set the alarm on the increasing, perhaps the increased, carbapenem resistance. In addition to routine antibiotic susceptibility testings, our results emphasize the importance of both the phenotypic and genotypic MBL detection methods in routine practice for early detection of carbapenem resistance and to prevent further dissemination of this resistant pathogen.

Download Full-text