Mtalib baumannii acinetobacter 2
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Transcript of Mtalib baumannii acinetobacter 2
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Acinetobacter baumannii
Maliha Talib MB 360 (Lee)
Spring 2014
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•Traced back to Vietnam War•Recent outbreak during Iraq War•Original outbreak from Europe•>> 700 soldiers effected
Origination
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General InformationTaxonomic Classification: •Bacteria; Proteobacteria; Gammaproteobacteria; Pseudomonadales; Moraxellaceae; Acinetobacter
Microbiologic Morphology: •gram negative •aerobic •cocco-bacillus•encapsulated•nonmotile •catalase-positive•oxidase-negative
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Catalase = positive The purpose is to see if the microbe has catalase or can destroy chemical hydrogen
peroxide.
Oxidase = negative Identifies organisms that
produce the enzyme cytochrome oxidase.
General Information
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General InformationHabitat•soil, water, food, sewage, & the hospital environment•resistant to desiccation and disinfection•Survive on moist & dry surfaces•forms bio-film on catheters, ventilators, and other medical devices•Iraq/Afghanistan
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General Information
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General Information
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Nutrition•grows on various media •can live in hospital settings 9 days after patient leaves•Acinetobacter calcoaceticus-baumanii complex: glucose-oxidising nonhemolytic, •Acinetobacter lwoffii: glucose-negative nonhemolytic •Acinetobacter haemolyticus: haemolytic on blood agar.
General Information
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PathogenesisDiseases•Bloodstream infections: pneumonia, urinary tract infections, and septicemia•mostly respiratory >> can lead to death •32 species: cause of 80% of infections •nosocomial
Examples of Major Infections•Ventilator-associated pneumonia •Urinary tract•Bloodstream infection •Secondary meningitis•Skin/wound infections•Endocarditis•CAPD-associated peritonitis•Ventriculitis
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Pathogenesis
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Pathogenesis
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Transmission •spread via person to person OR •contact with contaminated environment
Pathogenesis
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Pathogenesis
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• Bed rails• Bedside tables• Ventilators• Infusion pumps• Mattresses• Pillows• Air humidifiers• Patient monitors
• X-ray view boxes• Curtain rails• Curtains• Equipment carts• Sinks• Ventilator circuits• Floor mops
Transmission
Pathogenesis
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Mechanisms •Aminoglycosides-modifying enzymes •Broad-spectrum β-lactamases •Carbapenemases •Quantitative and/or qualitative changes in outer membrane porins •Altered penicillin-binding proteins.
Pathogenesis
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Circular map of A. baumannii genome.
Smith M G et al. Genes Dev. 2007;21:601-614
Copyright © 2007, Cold Spring Harbor Laboratory Press
Pathogenesis
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Pathogenesis
Symptoms•standard infection symptoms i.e. fever•death within 14 days of surgery
Predisposed factors •Malignancy•Trauma•Burns•Surgical wound infections•Neonates •Low birth weight•Need for mechanical ventilation
Diagnosis•clinical culture of blood, sputum, urine, wound, sterile body fluid, etc.
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Factors leading to the emergence and transmission of multidrug-resistant (MDR) Acinetobacter species.
Eliopoulos G M et al. Clin Infect Dis. 2008;46:1254-1263
© 2008 by the Infectious Diseases Society of America
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Treatment • Will collect: age, sex, occupation, hospital location at the time of positive culture (ER, medical ward, ICU etc), date of positive culture, prior hospitalization, receipt of outpatient dialysis, home care or other regular medical care (eg, outpatient chemotherapy), presence of invasive devices, receipt of antibiotics, etc.•Carbapenems (Imipenem and Meropenem) - growing resistance•Others: Polymyxin, Tigecycline and Aminoglycosides
Pathogenesis
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Pathogenesis
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Pathogenesis
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Methods for control and prevention of multidrug-resistant Acinetobacter infection.
PathogenesisPrevention: •Wash hands•contact precautions•environmental decontamination
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Antibiotic Resistance •naturally transformable•AcomFECB and comQLONM allow uptake of DNA from the environment •administration of subtheraputic doses of antimicrobial agents, drug overuse, interrupted courses of treatment, and poor tissue penetration by antimicrobial agent•Medical interventions increasing the Acinetobacter Infections
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• Most A. baumannii resistant: tampicillin, Carbenicillin, Cefotaxime and Chloramphenicol.
• Increasing resistance:Gentamycin, tobramycin and amikacin is increasing.
• May retain: Fluoroquinolones, ceftazidime,Trimethoprim-Sulphmethoxazole, Doxycycline, Polymyxin B, colistin, imipenem and meropenem
Antibiotic Resistance
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"Acinetobacter baumannii membrane transporter PilQ allows initial entry of foreign DNA into the cell. Foreign DNA is then bound by protein ComE and is directed to cytoplasmic membrane transporter ComA."
Antibiotic Resistance
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Sent troops to Iraq
Bush's increase of troops to protect Baghdad and Al Anbar Province
Antibiotic Resistance
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Cost of Outbreak
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Works Cited•Federico Perez, Andrea M. Hujer, Kristine M. Hujer, BrookeK. Decker, Philip N. Rather and Robert A. Bonomo Antimicrob. Agents Chemother. 2007, 51(10):3471. DOI:10.1128/AAC.01464-06. Published Ahead of Print 23 July 2007. •George M. Eliopoulos, Lisa L. Maragakis, and Trish M. Perl Acinetobacter baumannii: Epidemiology, Antimicrobial Resistance, and Treatment Options Clin Infect Dis. (2008) 46 (8): 1254-1263 doi:10.1086/529198•Hujer, K. Hujer, A. Hulten, E. Bajaksouzian, S. Adams, J. Donskey, C. Ecker, D. Massire, C. Eshoo, M., Sampath, R., Thomson, J. Rather, P., Craft, D., Fishbain, J., Ewell, A., Jacobs, M. Paterson, D., Bonomo, R. “Analysis of Antibiotic Resistance Genes in Multidrug-Resistant Acinetobacter sp. Isolates from Military and Civilian Patients treated at the Walter Reed Army Medical Center.” Antimicrboia Agents and Chemotherapy. Dec. 2006. Volume. 50, No. 12. 4114-4123.•José M. Cisneros, Maria J. Reyes, Jerónimo Pachón, Berta Becerril, Francisco J. Caballero, José L. García Garmendia, Carlos Ortiz, and Adelaido R. Cobacho Bacteremia Due to Acinetobacter baumannii: Epidemiology, Clinical Findings, and Prognostic Features Clin Infect Dis. (1996) 22 (6): 1026-1032 doi:10.1093/clinids/22.6.1026•Lenie Dijkshoorn, Alexandr Nemec & Harald Seifert An increasing threat in hospitals: multidrug-resistant Acinetobacter baumannii Nature Reviews Microbiology 5, 939-951 (December 2007) doi:10.1038/nrmicro1789•Mortensen, B. L. and Skaar, E. P. (2012), Host–microbe interactions that shape the pathogenesis of Acinetobacter baumannii infection. Cellular Microbiology, 14: 1336–1344. doi: 10.1111/j.1462-5822.2012.01817.x