DRUG-RESISTANT ACINETOBACTER BAUMANNII A GROWING SUPERBUG POPULATION. Cara Wilder Ph.D. Technical Writer March 13 th 2014
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1 DRUG-RESISTANT ACINETOBACTER BAUMANNII A GROWING SUPERBUG POPULATION Cara Wilder Ph.D. Technical Writer March 13 th 2014
2 ATCC Founded in 1925, ATCC is a non-profit organization with headquarters in Manassas, VA ATCC serves and supports the scientific community with industry-standard products and innovative solutions World s leading biological resource center and provider of biological standards Broad range of biological materials Microorganisms Cell lines Derivatives Bioproducts 2
3 Drug-resistance Drug-resistant bacteria are an emerging threat. Bad Bugs, No Drugs = No ESKAPE E S K A P E Photo credit: Janice Haney Carr 3
4 Antibiotic resistance Evolution & spread Evolution of MDR strains Inadequate infection control practices Overuse of antibiotics Misuse of antibiotics Dissemination within and between patients Invasive medical devices and procedures Inadvertent transmission Patient transfer between healthcare facilities Global travel and medical tourism 4
5 Antibiotic resistance Evolution & spread Inherent resistance Genetic mutation Horizontal gene transfer 5
6 Antibiotic resistance Mechanisms Reduced drug accumulation Antibiotic alteration Metabolic bypass Modification of target sites Antibiotic degradation Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 6
7 Acinetobacter baumannii Phenotype Natural habitat Clinical significance 7
8 Acinetobacter baumannii Grows at various temperatures Resistant to low humidity Survives on a variety of surfaces Phenotype 8
9 Acinetobacter baumannii Grows at various temperatures Resistant to low humidity Survives on a variety of surfaces Aquatic environments Soil Moist tissues Natural habitat 9
10 Acinetobacter baumannii Grows at various temperatures Resistant to low humidity Survives on a variety of surfaces Aquatic environments Soil Moist tissues Clinical significance Opportunistic pathogen Nosocomial infections Drug-resistance 10
11 Acinetobacter baumannii Infections Manifestation Pneumonia, bacteremia, meningitis, urinary tract infection, central venous catheter-related infection, and wound infection Communityacquired infections May be related to underlying conditions such as alcoholism, diabetes, or cancer Hospital-acquired infections Acquired by healthy or immunologically compromised patients Associated with wounds and invasive procedures Wartime-acquired infections Associated with wounded soldiers in non-native conflict zones 11
12 Antibiotic resistance Definitions Manchanda et al. J Glob Infect Dis. 2(3): ,
13 Antibiotic resistance Definitions Pan drug-resistance (PDR) Extensive drug-resistance (XDR) XDR strain + Resistance to polymyxins and tigecycline MDR strain + Resistance to carbapenems Multidrug-resistance (MDR) Resistant to 3 or more classes of drugs: Cephalosporins/Penicillins Fluoroquinolones Aminoglycosides Manchanda et al. J Glob Infect Dis. 2(3): ,
14 Antibiotic resistance in A. baumannii Beta-lactams Aminoglycosides Quinolones Tetracyclines Polymyxins 14
15 Antibiotic resistance in A. baumannii Beta-lactams 15
16 Antibiotic resistance in A. baumannii AdeABC efflux pump Reduction in porin number Reduced penicillin binding protein expression Beta-lactamases Beta-lactams Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 16
17 Antibiotic resistance in A. baumannii E P A A U G U G A C A U G C C A U G C C C G U A U G A Aminoglycosides 17
18 Antibiotic resistance in A. baumannii AdeABC efflux pump Aminoglycoside modifying enzymes Aminoglycosides Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 18
19 Antibiotic resistance in A. baumannii Quinolones 19
20 Antibiotic resistance in A. baumannii AdeABC efflux pump Modification of the genes encoding the DNA gyrase or topoisomerase IV Quinolones Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 20
21 Antibiotic resistance in A. baumannii E P A A U G U G A C A U G C C A U G C C C G U A U G A Tetracyclines 21
22 Antibiotic resistance in A. baumannii TetA and TetB efflux pumps Ribosomal protection protein Tetracyclines Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 22
23 Antibiotic resistance in A. baumannii Polymyxins 23
24 Antibiotic resistance in A. baumannii Lipopolysaccharide modification through acidification, acylation, or the presence of antigens the interfere with antibiotic binding Polymyxins Antibiotic degradation Antibiotic efflux Target modification Metabolic bypass Antibiotic alteration 24
25 Antibiotic resistance in A. baumannii Figure 2. Layout of the Complete AbaR1 Inserted into the AYE strain ATPase-Encoding Gene Fournier P-E, Vallenet D, Barbe V, Audic S, et al. (2006) 25
26 Therapeutics Pan drug-resistance (PDR) Extensive drug-resistance (XDR) XDR strain + Resistance to polymyxins and tigecycline Combination therapy MDR strain + Resistance to carbapenems Polymyxins Tigecycline Multidrug-resistance (MDR) Resistant to 3 or more classes of drugs: Cephalosporins/Penicillins Fluoroquinolones Aminoglycosides Multidrug-resistance (MDR) Carbapenems Polymyxins Durante-Mangoni E, and Zarrilli R. Future Microbiol 6, 2011, Manchanda et al. J Glob Infect Dis 2,
27 Emerging therapeutic approaches Vancomycin encapsulated in fusogenic liposomes Nicolosi D, et al. Int. J. Antimicrob. Agent 35(6): , Antimicrobial peptides Routsias JG, et al. Peptides 31(9): , Efflux pump inhibitors Pannek S, et al. J. Antimicrob. Chemother. 57(5): , Antisense agents (e.g. RNAi) Woodford N, Wareham DW. J. Antimicrob. Chemother. 63(2): ,
28 Prevention and control Determine organismspecific risks Determine patientspecific risks Develop a plan 28
29 Prevention and control Geographical location of bacteria Hospital-specific localization Determine organismspecific risks 29
30 Prevention and control Geographical location of bacteria Hospital-specific localization Length of stay Procedure performed Treatment Determine patientspecific risks 30
31 Prevention and control Geographical location of bacteria Hospital-specific localization Length of stay Procedure performed Treatment Develop a plan Implementation of new practices to reduce the occurrence of infection 31
32 Prevention and control Improve sanitation procedures and barrier precautions Reduce patient-topatient contact Use disposable equipment Limit indwelling devices Establish a surveillance plan Practice antimicrobial stewardship 32
33 ATCC Aiding the scientific community ATCC provides top-quality, authenticated reference strains and associated molecular materials Enhance diagnostics Analyze novel therapeutics Improve sterility protocols 33
34 ATCC Acinetobacter baumannii Drug-resistant clinical isolates 34
35 ATCC Strain authentication Phenotypic analysis Colony morphology Bacterial morphology Biochemical analysis Genotypic analysis 16S rrna sequencing Ribotyping 35
36 ATCC Verification of drug-resistance Antibiotic profiling using VITEK Penicillins Cephalosporins Carbapenems Quinolones Aminoglycosides Tetracycline Tigecycline 36
37 ATCC Acinetobacter baumannii ATCC Multidrug Resistant & Antimicrobial Reference Strains brochure available at 37
38 Bacteriology guide Chapters included: Getting started with an ATCC bacterial strain Bacterial growth and propagation Growth media Preservation Biosafety and disposal Bacterial authentication Bacterial applications Available on the ATCC website 38
39 Conclusion Multidrug-resistant, extensive drug-resistant, and pan drug-resistant A. baumannii strains are an emerging problem throughout the world ATCC acquires, authenticates, and distributes clinically-relevant strains that are essential to the scientific community Phenotypic, genotypic, functional testing Drug-resistant strains of A. baumannii are now available at ATCC Clinical strains Antibiotic susceptibility profiles available Identity Purity Authenticity Homogeneity Stability Functionality Comparability Quality Reproducibility Standardization Development Verification 39
40 Sources Durante-Mangoni E, Zarrilli R. Global Spread of Drug-resistant Acinetobacter baumannii. Future Microbiol. 6(4): , Manchanda V, Sanchaita S, Singh NP. Multidrug Resistant Acinetobacter. J Glob Infect Dis. 2(3): , Howard A, O Donoghue M, Feeney A, Sleator RD. Acinetobacter baumannii An emerging opportunistic pathogen. Virulence 3(3): , Maragakis LL, Perl TM. Acinetobacter baumannii: Epidemiology, Antimicrobial Resistance, and Treatment Options. Antimicrobial Resistance, Invited Article. April APIC. Guide to the elimination of multidrug-resistant Acinetobacter baumannii transmission in healthcare settings Perez F, et al. Global Challenge of Multidrug-Resistant Acinetobacter baumannii. Antimicrobial Agents and Chemotherapy 51(10): , Fournier PE, et al. Comparative Genomics of Multidrug Resistance in Acinetobacter baumannii. PLoS Genet 2(1): e7,
41 Thank you! Register for more webinars in the ATCC Excellence in Research webinar series at March 27, :00 AM, 3:00 PM EST Dr. Chengkang Zhang will discuss htert immortalized cell lines and their use as relevant models for cancer research. April 24, :00 AM, 3:00 PM EST Dr. Fang Tian will highlight cell lines that can be used to address recently identified genomic and clinical features of breast cancer subtypes. May 8, :00 AM, 3:00 PM EST Liz Kerrigan will discuss the importance of molecular standards, and how their use can contribute to improvements in assay reproducibility and reliability. Thank you for joining today! Please send additional questions to 41
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