A SEARCH FOR ASSOCIATION BETWEEN BIOFILM STRENGTH AND SITES OF INFECTION CAUSED BY ACINETOBACTER BAUMANNII COMPLEX

2021 ◽  
pp. 7-9
Author(s):  
Sudeb Roy ◽  
Moupiya Nandi ◽  
Debarshi Jana
Keyword(s):  
Acinetobacter Baumannii ◽  
Culture Media ◽  
Clinical Sample ◽  
Venous Catheter ◽  
Blood Stream ◽  
Multidrug Resistant ◽  
Blood Agar ◽  
Clinical Samples ◽  
Macconkey Agar ◽  
Eskape Pathogens

INTRODUCTION: In the world of infectious diseases, a group of bacteria known as ESKAPE pathogens, are responsible for most of the life threatening multidrug resistant (MDR) and extensively drug resistant (XDR) infections worldwide. The ESKAPE pathogens comprise of Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, Enterobacter spp. AIMS AND OBJECTIVES: The objective of this study is isolate and identify Acinetobactor baumannii complex from clinical samples. Measure the biolm forming capacity of the isolates. Possible association of this biolm strength with the type of clinical sample from which they are isolated. MATERIALS AND METHODS: The samples which were tested in the laboratory were the following: Sputum, End tracheal tube aspirates, Pus, Urine, Blood for culture, Central venous catheter tips & Cerebrospinal uid. Following culture media were taken: MaCconkey agar & Blood agar. The colonies suggestive of Acinetobacter baumannii were selected. On MaCconkey agar, non- pigmented NLF colonies with pink to light lavender hue; and on blood agar, opaque non-hemolytic colonies were obtained. Gram stains from selected colony showed gram negative coccobacilli. Hanging drop preparation showed non-motile bacteria. RESULTS AND ANALYSIS: We found maximum number of strong biolm producers were found among the isolates causing infection of CVC tips (70%). This was closely followed by ETtube isolates (69.5%). The isolates from blood stream, urine, and sputum samples showed all the three patterns, namely, no biolm producer, moderate biolm producer, and strong biolm producer. Our study showed interestingly, no strong biolm producer was found from pus samples, whereas from the CSF isolates no non-producer of biolm emerged. CONCLUSION: This study centers around strength or pattern of biolm formation by this bacteria. It was interesting to nd that there was a statistically signicant association between patterns of biolm produced by Acinetobacter baumannii and the various samples from which they are isolated. This made us to hint at a probable relation between biolm patterns and organotropism as an hypothesis. Only further investigations will tell if it can stand the test of time.

scholarly journals 1293. Sulbactam-durlobactam is active against recent, multi-drug resistant Acinetobacter baumannii clinical isolates from the Middle East

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S662-S662
Author(s):  
Alita Miller ◽  
Sarah McLeod ◽  
Samir Moussa ◽  
Meredith Hackel
Keyword(s):  
Antibacterial Activity ◽  
Middle East ◽  
Acinetobacter Baumannii ◽  
United Arab Emirates ◽  
Blood Stream ◽  
Multidrug Resistant ◽  
Clinical Isolates ◽  
Surveillance Systems ◽  
Spectrum Activity

Abstract Background The incidence of infections caused by multidrug-resistant (MDR) Acinetobacter baumannii (Ab) is increasing at an alarming rate in certain regions of the world, including the Middle East. Sulbactam (SUL) has intrinsic antibacterial activity against Ab; however, the prevalence of β-lactamases in Ab has limited its therapeutic utility. Durlobactam (DUR, formerly ETX2514) is a diazabicyclooctenone β-lactamase inhibitor with broad-spectrum activity against Ambler class A, C and D β-lactamases that restores SUL activity in vitro against MDR Ab. SUL-DUR is an antibiotic designed to treat serious infections caused by Acinetobacter, including multidrug-resistant strains, that is currently in Phase 3 clinical development. In global surveillance studies of >3600 isolates from 2012-2017, the MIC90 of SUL-DUR was 2 mg/L. Although surveillance systems to monitor MDR infections in the Middle East are currently being established, quantitative, prevalence-based data are not yet available. Therefore, the potency of SUL-DUR was determined against 190 recent, diverse Ab clinical isolates from this region. Methods 190 Ab isolates were collected between 2016 - 2018 from medical centers located in Israel (N = 47), Jordan (N = 36), Qatar (N = 13), Kuwait (N = 42), Lebanon (N = 8), Saudi Arabia (N = 24) and United Arab Emirates (N = 20). Seventy-five percent and 20.5% of these isolates were from respiratory and blood stream infections, respectively. Susceptibility to SUL-DUR and comparator agents was performed according to CLSI guidelines, and data analysis was performed using CLSI and EUCAST breakpoint criteria where available. Results This collection of isolates was 86% carbapenem-resistant and 90% sulbactam-resistant (based on a breakpoint of 4 mg/L). The addition of SUL-DUR (fixed at 4 mg/L) decreased the sulbactam MIC90 from 64 mg/L to 4 mg/L. Only 3 isolates (1.6%) had SUL-DUR MIC values of > 4 mg/L. This potency was consistent across countries, sources of infection and subsets of resistance phenotypes. Conclusion SUL-DUR demonstrated potent antibacterial activity against recent clinical isolates of Ab from the Middle East, including MDR isolates. These data support the global development of SUL-DUR for the treatment of MDR Ab infections. Disclosures Alita Miller, PhD, Entasis Therapeutics (Employee) Sarah McLeod, PhD, Entasis Therapeutics (Employee) Samir Moussa, PhD, Entasis Therapeutics (Employee)

scholarly journals Evaluation of Specific Risk Factors and Outcomes of Colistin-Resistant Klebsiella pneumoniae Infections in a Tertiary Care Centre - An Observational Study

2021 ◽  
Vol 4 (2) ◽  
pp. 1-6
Author(s):  
Prakash Shastri ◽  
Shamanth A Shankarnarayan
Keyword(s):  
Risk Factors ◽  
Blood Stream Infection ◽  
Tertiary Care ◽  
Venous Catheter ◽  
Blood Stream ◽  
Central Line ◽  
Multidrug Resistant ◽  
Automated System ◽  
Tertiary Care Centre ◽  
Broth Microdilution Method

Background: Incidence of multidrug resistant Klebsiella pnumoniae infections are increasing globally especially in ICUs. Aim: We evaluated the burden of colistin resistant K. pneumoniae (ColR KP) and the risk factors associated with the outcome of these patients. Methods: Consecutive patients developing K. pneumoniae infections were included. K. pneumoniae from endotracheal tube and catheterized urine sample, having cell count <105 cfu/ml, and which did not necessitate a change in antibiotics as per the treating physicians was considered as colonizer. Demographic and clinical details were collected and samples were processed as per standard protocol. Any growth was identified and its antimicrobial susceptibility was carried out by using Vitek 2 automated system. Minimum inhibitory concentration of >4 μg/ml for Colistin was considered as resistant. The resistant isolates were confirmed with Broth microdilution method. Risk factor associated with the outcome of ColR KP was analyzed. Findings: Burden of K. pneumoniae infection was 50.02 per 1000 admissions. K. pneumonie (n=155) was isolated from patients with ventilator associated pneumonia (84, 54.2%), followed by blood stream infection (49, 31.6%) and urinary tract infection (22, 14.2%). ColR KP and intermediate (ColI KP) isolates were 58 (37.41%) and 97 (62.6%) respectively. Among ColR KP infected patients 32 (55.1%) died whereas 26 (44.8%) patients were discharged. Higher mortality was witnessed in ColI KP cases (75, 77.3%) compared to ColR-KP cases (32, 55.1%) (p=0.004; OR=2.77; 95% CI=1.37 to 5.59). Colistin resistance and presence of central line were independently associated with mortality. Conclusion: Colistin resistant K. pneumoniae infections among ICU patients are on rise. Presence of central venous catheter and resistance to colistin were independent predictors of mortality.

scholarly journals Detection of multidrug-resistant Enterobacteriaceae isolated from river waters flowing to the Guanabara Bay and from clinical samples of hospitals in Rio de Janeiro, Brazil

Biomédica ◽  
2019 ◽  
Vol 39 ◽  
pp. 135-149
Author(s):  
Verônica Dias Gonçalves ◽  
Frederico Meirelles-Pereira ◽  
Márcio Cataldo ◽  
Bianca De Oliveira Fonseca ◽  
Barbara Araujo Nogueira ◽  
...  
Keyword(s):  
Water Samples ◽  
Culture Media ◽  
Animal Husbandry ◽  
Multidrug Resistant ◽  
Clinical Samples ◽  
Guanabara Bay ◽  
Beta Lactam ◽  
Beta Lactam Antibiotics ◽  
Genes Encoding ◽  
Extended Spectrum Beta Lactamases

Introduction: The use of antibiotics in humans, animal husbandry and veterinary activities induces selective pressure leading to the colonization and infection by resistant strains.Objective: We evaluated water samples collected from rivers of the Guanabara Bay, which have suffered minor and major environmental degradation, and clinical samples of hospital origin to detect evidence of the presence of resistance genes to aminoglycosides, beta-lactam antibiotics and fluoroquinolones in strains of Klebsiella pneumoniae subsp. pneumoniae, K. pneumoniae subsp. ozaenae and Escherichia coli.Materials and methods: For isolation of the water strains we employed culture media containing 32 μg/ml cephalotin and 8 μg/ml gentamicin. The strains from clinical materials were selected using culture media containing 8 μg/ml gentamicin. The strains were identified and subjected to antimicrobial susceptibility testing (AST), plasmid DNA extraction and polymerase chain reaction (PCR) to detect genes encoding enzymes modifying aminoglycosides (EMA), extended-spectrum beta-lactamases (ESBL) and plasmid mechanisms of quinolone resistance (PMQR).Results: The AST of the isolates recovered from water samples showed multidrugresistance profiles similar to those found in isolates recovered from clinical materials. All isolates from water samples and 90% of the isolates from clinical samples showed at least one plasmid band. In the PCR assays, 7.4% of the isolates recovered from water samples and 20% of those from clinical materials showed amplification products for the three antimicrobial classes.Conclusion: We believe that the detection of microorganisms presenting genetic elements in environments such as water is necessary for the prevention and control of their dissemination with potential to infect humans and other animals in eventual contact with these environments.

scholarly journals In vitro activity of colistin against multidrug-resistant Acinetobacter baumannii isolates harboring blaOXA-23-like and blaOXA-24-like genes: A multicenter based study

2020 ◽  
Vol 67 (3) ◽  
pp. 182-186
Author(s):  
Susan Khanjani ◽  
Hadi Sedigh Ebrahim-Saraie ◽  
Mohammad Shenagari ◽  
Ali Ashraf ◽  
Ali Mojtahedi ◽  
...  
Keyword(s):  
Acinetobacter Baumannii ◽  
Carbapenem Resistance ◽  
Multidrug Resistant ◽  
Resistance Rate ◽  
Clinical Isolates ◽  
Clinical Samples ◽  
Cross Sectional ◽  
The North ◽  
North Of Iran

AbstractThis study was aimed to evaluate occurrence of antibiotic resistance and the presence of resistance determinants among clinical isolates of Acinetobacter baumannii. This cross-sectional study from January to September 2018 was performed on 59 A. baumannii strains isolated from clinical samples in the north of Iran. Isolates were identified by standard microbiologic tests and molecular method. Antimicrobial susceptibility testing was carried out by disk diffusion and broth microdilution methods. The presence of carbapenem resistance genes was detected by PCR method. All isolates were resistant to cefepime, meropenem, imipenem and ceftazidime. The lowest resistance rate was observed against doxycycline with 33.9%. Minimum inhibitory concentration (MIC) results showed that all carbapenem-resistant A. baumannii (CRAB) isolates were susceptible to colistin with MIC50 and MIC90 values of 1/2 µg/mL. Among 59 CRAB, blaOXA-23-like was the most prevalent gene (86.4%) followed by blaOXA-24-like (69.5%). Meanwhile, none of the clinical isolates harbored blaOXA-58-like gene. We found a high prevalence of CRAB strains harboring OXA-type carbapenemases in the north of Iran. Our results suggests that the presence of OXA-type genes was not directly correlated with the increase of imipenem MIC level, but can be clinically important as they contribute to the selection of CRAB strains.

scholarly journals Molecular Detection of Carbapenemase-Encoding Genes in Multidrug-Resistant Acinetobacter baumannii Clinical Isolates in South Africa

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Yaw Adjei Anane ◽  
Teke Apalata ◽  
Sandeep Vasaikar ◽  
Grace Emily Okuthe ◽  
Sandile Songca
Keyword(s):  
South Africa ◽  
Acinetobacter Baumannii ◽  
Multidrug Resistant ◽  
Clinical Samples ◽  
Eastern Cape ◽  
Healthcare Facilities ◽  
Microdilution Method ◽  
Broth Microdilution Method ◽  
High Level ◽  
Encoding Genes

Introduction. Carbapenem-resistant Acinetobacter baumannii has been responsible for an increasing number of hospital-acquired infections globally. The study investigated the prevalence of carbapenemase-encoding genes in clinical multidrug-resistant A. baumannii strains. Materials and Methods. A total of 100 nonduplicate multidrug-resistant A. baumannii strains were cultured from clinical samples obtained from healthcare facilities in the O. R. Tambo district. The strains were confirmed by detecting the intrinsic blaOXA-51-like gene. Antimicrobial susceptibility testing was performed by VITEK® 2 and autoSCAN-4 systems. The MIC of imipenem and meropenem was rechecked by E-test. Colistin MIC was confirmed by the broth microdilution method. Real-time PCR was performed to investigate the presence of carbapenemase-encoding genes. Results. Most strains showed high resistance rates (>80%) to the antibiotics tested. Resistance to amikacin, tetracycline, and tigecycline were 50%, 64%, and 48%, respectively. All strains were fully susceptible to colistin. The blaOXA-51-like was detected in all strains whilst blaOXA-23-like, blaOXA-58-like, blaOXA-24-like, blaIMP-1, blaVIM, and blaNDM-1 were found in 70%, 8%, 5%, 4%, 3%, and 2% of strains, respectively. None of the tested strains harboured the genes blaSIM and blaAmpC. The coexistence of blaOXA-23-like, and blaIMP-1 or blaOXA-58-like was detected in 1% and 2% strains, respectively. A distinct feature of our findings was the coharbouring of the genes blaOXA-23-like, blaOXA-58-like, and blaIMP-1 in 2% strains, and this is the first report in the Eastern Cape Province, South Africa. The intI1 was carried in 80% of tested strains whilst ISAba1/blaOXA-51-like and ISAba1/blaOXA-23-like were detected in 15% and 40% of the strains, respectively. The detection of blaOXA-23-like, ISAba1/blaOXA-51-like, ISAba1/blaOXA-23-like, and blaOXA-23-like, blaOXA-58-like, and blaIMP-1 carbapenemases in strains had a significant effect on both imipenem and meropenem MICs. Conclusions. Results showed a high level of oxacillinases producing A. baumannii circulating in our study setting, highlighting the need for local molecular surveillance to inform appropriate management and prevention strategies.

scholarly journals Comparative Study of Hicrome Agar Medium with Conventional Culture System for the Isolation of Uropathogens

2018 ◽  
Vol 24 (2) ◽  
pp. 128-135
Author(s):  
S Gul Nahar ◽  
M Bulbul Hasan ◽  
Mst Rokeya Khatun ◽  
M Nawshad Ali
Keyword(s):  
Urine Culture ◽  
Culture Media ◽  
Agar Medium ◽  
Blood Agar ◽  
Macconkey Agar ◽  
Biochemical Tests ◽  
College Hospital ◽  
Conventional Culture ◽  
Presumptive Identification ◽  
Chromogenic Agar

Objective: The present study was done to compare the performance of chromogenic agar medium and conventional culture media for the isolation and presumptive identification of uropathogen.Methodology: A total 300 sample were collected from Rajshahi Medical College Hospital, Bangladesh during January to June, 2008. Urine samples of the suspected UTI cases, showing pus cells >5/HPF on microscopic examination were included for urine culture simultaneously onto 2 conventional media (Blood agar and MacConkey agar) and chromogenic agar medium (HiCrome UTI agar medium). Results: Culture yielded 139 (46.33%) bacterial growth among them, 133 (44.33%) showed single organism and remaining 06 (2.00%) showed mixed growth of two organisms in different combinations. It is evident from the present study that both HiCrome UTI agar and Blood agar (BA) media supported growth of all 145 bacteria, while MacConkey (MAC) agar yielded 133(91.72%) bacterial growths. The rate of presumptive identification of the isolates was found significantly higher (97.24%) on HiCrome UTI agar when compared with the MacConkey agar (80.68%) and Blood agar (27.58%) media. Out of 91 E. coli isolated, 88(96.70%) could be identified differentially on HiCrome UTI agar medium in contrast to 85(93.40%) on MacConkey agar and only 06(06.59%) on Blood agar. Again, all 06 (100%) of the isolate-pairs of mixed growth were identified distinctly on HiCrome UTI agar, whereas both Blood agar and MacConkey agar media could revealed only 01(16.66%) of the polymicrobial growth.Conclusion: HiCrome UTI agar medium has been documented for its very high yielding rate, rapid presumptive identification of both single and polymicrobial growths with greater precision and avoidance of biochemical tests for further identification of uropathogens. Thus it can be recommended as primary urine culture medium to be used by the clinical microbiology laboratories.TAJ 2011; 24(2): 128-135

Prevalence and molecular mechanisms of colistin resistance in Acinetobacter baumannii clinical isolates in Tehran, Iran

2021 ◽  
Author(s):  
Amin Khoshbayan ◽  
Aref Shariati ◽  
Samane Shahmoradi ◽  
Zohre Baseri ◽  
Haniyeh Mozafari ◽  
...  
Keyword(s):  
Acinetobacter Baumannii ◽  
Molecular Mechanisms ◽  
Antimicrobial Agents ◽  
Multidrug Resistant ◽  
Clinical Samples ◽  
Gram Negative Bacteria ◽  
Colistin Resistance ◽  
Two Component System ◽  
Reverse Transcription Pcr ◽  
Polymerase Chain

AbstractColistin is one of the last remaining active antibiotics against multidrug resistant Gram-negative bacteria. However, several recent studies reported colistin-resistant (ColR) Acinetobacter baumannii from different countries. In the current study, we investigated molecular mechanisms involved in colistin resistance in A. baumannii isolates from different clinical samples.A total of 110 clinical A. baumannii isolates were collected from two hospitals in Tehran. Minimum inhibitory concentrations (MICs) were determined by broth microdilution according to the Clinical and Laboratory Standards Institute. For the ColR isolates, mutation was detected in pmrA, pmrB, lpxA, lpxC, and lpxD genes using the polymerase chain reaction (PCR) and sequencing. Moreover, the relative expression of the pmrC gene was calculated using quantitative reverse transcription PCR. Three colistin resistant isolates were identified with MIC between 8 and 16 μg/mL and were resistant to all the tested antimicrobial agents. All the three isolates had a mutation in the pmrB, pmrA, lpxA, lpxD, and lpxC genes. Moreover, the overexpression of pmrC gene was observed in all isolates. Our results showed that the upregulation of the PmrAB two component system was the primary mechanism linked to colistin resistance among the studied colistin resistant A. baumannii isolates.

scholarly journals Use of colistin and sorbitol for better isolation ofSerratia marcescensin clinical samples

1988 ◽  
Vol 101 (2) ◽  
pp. 315-320 ◽  
Author(s):  
G. M Grasso ◽  
M. M D'errico ◽  
F Schioppa ◽  
F Romano ◽  
D Montanaro
Keyword(s):  
Serratia Marcescens ◽  
Culture Media ◽  
Clinical Samples ◽  
Macconkey Agar ◽  
Isolation Rate ◽  
Primary Isolation ◽  
Clinical Specimens ◽  
Cost Efficient

SUMMARYA comparison was made of different culture media and procedures for detection ofSerratia marcescensfrom faecal, pharyngeal and ocular swabs collected from 213 neonates. MacConkey agar and MacConkey agar with sorbitol (1%) and/or colistin (200 i.u./ml) were used both for primary isolation and after enrichment using Mossel Enterobacteriaceae broth with colistin (200 i.u./ml). The use of MacConkey agar supplemented with colistin for primary isolation improved considerably the isolation rate ofS. marcescensfrom faecal swabs but not from pharyngeal swabs; the number of ocular isolations were insufficient to demonstrate differences between procedures. Moreover the enrichment procedures consistently increased the number ofS. marcescensisolates especially from pharyngeal and ocular swabs. Use of sorbitol made detection ofS'. marcescensfrom clinical specimens easier and time– and cost–efficient.

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