scholarly journals Molecular mechanisms of antibiotic co-resistance among carbapenem resistant Acinetobacter baumannii

2019 ◽  
Vol 13 (10) ◽  
pp. 899-905 ◽  
Author(s):  
Mohsin Khurshid ◽  
Muhammad Hidayat Rasool ◽  
Muhammad Hussnain Siddique ◽  
Farrukh Azeem ◽  
Muhammad Naeem ◽  
...  
Keyword(s):  
Acinetobacter Baumannii ◽  
Molecular Mechanisms ◽  
Antimicrobial Agents ◽  
Tertiary Care ◽  
Antibiotic Resistance Genes ◽  
Polymyxin B ◽  
Beta Lactam ◽  
Genetic Determinants ◽  
Carbapenem Resistant ◽  
Tertiary Care Hospitals

Introduction: The spread of carbapenem-resistant Acinetobacter baumannii (CRAB) is difficult to control especially in the hospitals due to the successful mobilization and evolution of the genetic elements harboring the resistant determinants. The study was conducted to examine the distribution of aminoglycosides, tetracycline, and sulfonamide-resistant determinants among CRAB isolates that carry the blaOXA-23 gene. Methodology: For a total of 160 CRAB strains isolated at tertiary care hospitals of Pakistan that mainly carried blaOXA-23 gene were included in the study to evaluate the assortment of antibiotic resistance genes. Results: The susceptibility rates of CRAB for other than beta-lactam drugs were 2.5% for both ciprofloxacin and aminoglycosides and 18% and 25% for sulfonamides and tetracyclines, respectively. Polymyxin B (MIC90, 1 g/mL) Colistin (MIC90, 1 g/mL) and Tigecycline (MIC90, 2 g/mL) were most active against these extensively drug-resistant CRAB isolates. The isolates were found to possess various genes mainly the tetB and sul2 for tetracycline and sulfonamide but the genes conferring resistance to aminoglycosides were varied with various combinations. Conclusion: Despite the CRAB clones containing blaOXA-23 have been previously reported in Pakistani hospitals, the screening of genetic determinants responsible for other antimicrobial agents is crucial for developing an effective surveillance and mitigation system for infection management.

scholarly journals Carbapenem-Resistant Acinetobacter baumannii in Three Tertiary Care Hospitals in Mexico: Virulence Profiles, Innate Immune Response and Clonal Dissemination

2019 ◽  
Vol 10 ◽  
Author(s):  
María Dolores Alcántar-Curiel ◽  
Roberto Rosales-Reyes ◽  
Ma Dolores Jarillo-Quijada ◽  
Catalina Gayosso-Vázquez ◽  
José Luis Fernández-Vázquez ◽  
...  
Keyword(s):  
Immune Response ◽  
Acinetobacter Baumannii ◽  
Innate Immune Response ◽  
Tertiary Care ◽  
Innate Immune ◽  
Carbapenem Resistant ◽  
Tertiary Care Hospitals

scholarly journals Dissemination of Acinetobacter baumannii Clones with OXA-23 Carbapenemase in Colombian Hospitals

2007 ◽  
Vol 51 (6) ◽  
pp. 2001-2004 ◽  
Author(s):  
Maria Virginia Villegas ◽  
Juan Nicolas Kattan ◽  
Adriana Correa ◽  
Karen Lolans ◽  
Ana Maria Guzman ◽  
...  
Keyword(s):  
South America ◽  
Acinetobacter Baumannii ◽  
Tertiary Care ◽  
Multidrug Resistant ◽  
Surveillance Network ◽  
Carbapenem Resistant ◽  
Nationwide Surveillance ◽  
Tertiary Care Hospitals ◽  
Widespread Dissemination

ABSTRACT During 2005, 66 carbapenem-resistant isolates of Acinetobacter baumannii were collected from seven tertiary-care hospitals participating in a nationwide surveillance network in Colombia. The isolates were multidrug resistant and produced the carbapenemases OXA-23 and OXA-51. Forty-five belonged to four clones while 21 were unique pulsotypes. One clone was present in two hospitals within one city, while another had spread between two hospitals in different cities. Blood, secretions, and abdominal fluids were the most frequent sites of isolation. This is the first description of widespread dissemination of OXA-23 in South America.

scholarly journals Prevalence of OXA-Type β-Lactamase Genes among Carbapenem-Resistant Acinetobacter baumannii Clinical Isolates in Thailand

Antibiotics ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 864
Author(s):  
Krit Thirapanmethee ◽  
Thayapa Srisiri-a-nun ◽  
Jantana Houngsaitong ◽  
Preecha Montakantikul ◽  
Piyatip Khuntayaporn ◽  
...  
Keyword(s):  
Acinetobacter Baumannii ◽  
Tertiary Care ◽  
Carbapenem Resistance ◽  
Resistance Mechanisms ◽  
Clinical Isolates ◽  
Health Concern ◽  
Drug Of Choice ◽  
Carbapenem Resistant ◽  
Resistance Rates ◽  
Tertiary Care Hospitals

Carbapenem-resistant Acinetobacter baumannii (CRAB) is a critical health concern for the treatment of infectious diseases. The aim of this study was to investigate the molecular epidemiology of CRAB emphasizing the presence of oxacillinase (OXA)-type β-lactamase-encoding genes, one of the most important carbapenem resistance mechanisms. In this study, a total of 183 non-repetitive CRAB isolates collected from 11 tertiary care hospitals across Thailand were investigated. As a result, the blaoxa-51-like gene, an intrinsic enzyme marker, was detected in all clinical isolates. The blaoxa-23-like gene was presented in the majority of isolates (68.31%). In contrast, the prevalence rates of blaoxa-40/24-like and blaoxa-58-like gene occurrences in CRAB isolates were only 4.92% and 1.09%, respectively. All isolates were resistant to carbapenems, with 100% resistance to imipenem, followed by meropenem (98.91%) and doripenem (94.54%). Most isolates showed high resistance rates to ciprofloxacin (97.81%), ceftazidime (96.72%), gentamicin (91.26%), and amikacin (80.87%). Interestingly, colistin was found to be a potential drug of choice due to the high susceptibility of the tested isolates to this antimicrobial (87.98%). Most CRAB isolates in Thailand were of ST2 lineage, but some belonged to ST25, ST98, ST129, ST164, ST215, ST338, and ST745. Further studies to monitor the spread of carbapenem-resistant OXA-type β-lactamase genes from A. baumannii in hospital settings are warranted.

Molecular detection of blaOXA-23gene and blaOXA-51 gene in carbapenem resistant strains of Acinetobacterbaumannii in patients with ventilator associated pneumonia at tertiary care hospital

2021 ◽  
Vol 71 (11) ◽  
pp. 2576-2581
Author(s):  
Saima Ishtiaq ◽  
Sidrah Saleem ◽  
Abdul Waheed ◽  
Arslan Ahmed Alvi
Keyword(s):  
Acinetobacter Baumannii ◽  
Tertiary Care ◽  
Carbapenem Resistance ◽  
Conventional Polymerase Chain Reaction ◽  
Diffusion Method ◽  
Military Hospital ◽  
Care Hospital ◽  
Acinetobacter Baumanii ◽  
Cross Sectional ◽  
Carbapenem Resistant

Objective: To evaluate carbapenem resistance and to detect blaOXA-23 and blaOXA-51 genes in carbapenem-resistant acinetobacter baumanii isolates recovered from patients having pneumonia secondry to ventilation. Methods: The cross-sectional study was conducted from July 2017 to June 2018 at the Department of Microbiology, University of Health Sciences, Lahore, Pakistan, and comprised endotracheal aspirates / tracheobroncheal lavage samples from patients irrespective of age and gender who developed pneumonia after being on the ventilator for 48 hrs at the Combined Military Hospital, and Jinnah Hospital, Lahore.  The samples were inoculated on MacConkey and blood agar and aerobically incubated at a temperature of 370C for 18-24 hours. The isolated organisms were further assessed by standard morphological, cultural and biochemical profile. Antibiotic susceptibility was done by Kirby-Bauer disc diffusion method. Carbapenem-resistant acinetobacter baumannii were checked for carbapenemase production using Modified Hodge Test. Conventional polymerase chain reaction and agarose gel electrophoreses were performed to detect blaOXA-23 and blaOXA-51 genes. Data was analysed using SPSS 17. Results: Out of 157 samples, 92(58.6%) yielded growth of bacteria, and, among them, 39(42.4%) were identified as acinetobacter baumannii. All (100%) acinetobacter baumannii cases showed resistance to carbapenem, were producing carbapenemase enzyme, and were positive for blaOXA-51 gene. The blaOXA-23 gene was amplified in 38(97.4%) isolates. Conclusion: BlaOXA-23 gene appeared to be the major cause of carbapenem resistance. Continuous...

scholarly journals Molecular Characterization of Carbapenem-Resistant Acinetobacter baumannii Clinical Isolates from Egyptian Patients

2020 ◽  
Author(s):  
Reem M Hassan ◽  
Sherifa T Salem ◽  
Saly Ismail Mostafa Hassan ◽  
Asmaa Sayed Hegab ◽  
Yasmine S Elkholy
Keyword(s):  
Acinetobacter Baumannii ◽  
Molecular Characterization ◽  
Antimicrobial Agents ◽  
Treatment Options ◽  
Carbapenem Resistance ◽  
Clinical Isolates ◽  
Common Mechanism ◽  
Carbapenem Resistant ◽  
Egyptian Patients ◽  
Global Threat

AbstractAcinetobacter baumannii (A. baumannii) represents a global threat owing to its ability to resist most of the currently available antimicrobial agents. Moreover, emergence of carbapenem resistant A. baumannii (CR-AB) isolates limits the available treatment options. Enzymatic degradation by variety of ß-lactamases, have been identified as the most common mechanism of carbapenem resistance in A. baumannii. The alarming increase in the prevalence of CR-AB necessitates continuous screening and molecular characterization to appreciate the problem. The present study was performed to assess the prevalence and characterize carbapenemases among 206 CR-AB isolated from various clinical specimens collected from different intensive care units at Kasr Al-Aini Hospital.All isolates were confirmed to be A. baumannii by detection of the blaOXA-51-like gene. Molecular screening of 13 common Ambler class bla carbapenemases genes in addition to insertion sequence (IS-1) upstream OXA-23 was performed by using four sets of multiplex PCR, followed by identification using gene sequencing technology. Among the investigated genes, the prevalence of blaOXA-23, and blaOXA-58 were 77.7%, and 1.9%, respectively. The ISAba1 was detected in 10% of the blaOXA-23 positive isolates. The prevalence of metallo-β-lactamases (MBLs) studied; blaNDM-1, blaSPM, blaVIM, blaSIM-1 were 11.7%, 6.3%, 0.5%, and 0.5% respectively. One of class A; bla KPC was detected in 10.7% of the investigated isolates. blaOXA-24/40, blaIMP, blaGES, blaVEB and blaGIM were not detected in any of the studied isolates. Moreover, 18.4% of the isolates have shown to harbor two or more of the screened bla genes. We concluded that the most prevalent type of ß-lactamases genes among CR-AB isolates collected from Egyptian patients were blaOXA-23 followed by blaNDM-1 and blaKPC.Author summaryCarbapenem-resistant A. baumannii has become a real global health threat. The aim of the present study was to characterize and to assess the prevalence of carbapenemases among 206 CR-AB clinical isolates from Egyptian patients. We concluded that the most prevalent type of ß-lactamases genes among CR-AB isolates collected from Egyptian patients were blaOXA-23 followed by blaNDM-1 and blaKPC. In this study, ISAba1 was detected upstream 10% of blaOXA-23 positive isolates only which indicates that the spread of resistance among Acinetobacter isolates could be either chromosomal or plamid-mediated.

scholarly journals DRUG UTILIZATION STUDY IN THE ORTHOPEDICS OUTPATIENT DEPARTMENT OF A TERTIARY CARE HOSPITAL IN MAHARASHTRA

2018 ◽  
Vol 11 (9) ◽  
pp. 224
Author(s):  
Madhuri Kulkarni ◽  
Anant Patil
Keyword(s):  
Retrospective Study ◽  
Drug Utilization ◽  
Antimicrobial Agents ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Care Hospital ◽  
Beta Lactam ◽  
Drug Utilization Study ◽  
Beta Lactam Antibiotics ◽  
Prescribed Medicines

Objective: The objective of this study was to analyze the pattern of drug utilization in outpatients of orthopedics department from a tertiary care hospital.Material and Methods: In this retrospective study, prescriptions of randomly selected patients attending orthopedics clinic were screened to analyze a number of medicines per prescription. Number and percentages of prescribed medicines were calculated.Results: In this study, 512 patients (male 260 [50.8%] and females 252 [49.2%]) were included in the study. The total number of prescribed medicines was 1562, accounting for 3.1 medicines per patient. A total number of oral, parenteral, and topical medicines were 1375 (88%), 176 (11.3%), and 11 (0.7%), respectively. Nonsteroidal anti-inflammatory agents (NSAIDs), antacid/anti-ulcerants, and antimicrobial agents were 641 (41%), 371 (23.8%), and 102 (6.5%), respectively. A total of 54 (52.9%), 29 (28.4%), 9 (8.8%), 6 (5.9%), 3 (2.9%), and 1 (1%) patients were prescribed fluoroquinolones, beta-lactam antibiotics, metronidazole, trimethoprim plus sulfamethoxazole, macrolides, and doxycycline, respectively. For 371 (23.8%) patients, anti-ulcerant and antiulcer were prescribed, among which ranitidine was the most common prescription [353 (95.1%)]Conclusion: Number of medicines prescribed per patient in orthopedic clinic was 3.1. NSAIDs and antacid/anti-ulcerants were the most commonly prescribed medicines.

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