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Update on ESBLS and Carbapenem Resistant Enterobacteriaceae

Update on ESBLS and Carbapenem Resistant Enterobacteriaceae. Michael Costello, Ph.D. Technical Director – Microbiology ACL Laboratories. Topics To Cover. Extended spectrum β lactamases ( ESBLs)

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Update on ESBLS and Carbapenem Resistant Enterobacteriaceae

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  1. Update on ESBLS and Carbapenem Resistant Enterobacteriaceae Michael Costello, Ph.D. Technical Director – Microbiology ACL Laboratories

  2. Topics To Cover • Extended spectrum β lactamases (ESBLs) • Update on the recent changing patterns of different types of ESBLs in the Chicago/Milwaukee area • Implications • Healthcare associated infections (HAI) Vs. community acquired infections • Carbapenemases – more than “just” KPC • Summarize carbapenemases currently found in the Wisconsin/Illinois area • Expand on how and why CREs have spread so rapidly throughout the world. • Define testing algorithms for rapid detection of CRE, faster the better • Talk about new molecular based tests that are becoming available • Molecular assays for identification of bacteria and resistance genes directly from a positive blood culture bottle. • Culture not required

  3. Antibiotic Resistance • Gram Negatives • Production of β-lactamases – Enzymatic destruction of antibiotic • Switch from Tem and SHV to CTX-M • Permeability alterations • Porin mutations – antibiotic entry is limited • Porins are barrel shaped proteins that cross cell membranes and act as a port though which nutrients, toxins and antibiotics can diffuse • Antibiotic extrusion by efflux pumps • Rapidly pump out antibiotics before they are effective • Rarely, PBP alterations • PBP 7-8 in A. baumanii • Combinations of the above

  4. Changing ESBL patterns out with the old (Tem, Shv) and in with the new [ESBL (CTX-M), carbapenemases (KPC, NDM-1)] Target is still the same – β-lactam ring Only difference between peniclliniases, cephalosporinases and carbapenemases is the preferred substrate

  5. Classification of ß-Lactamases Bush-Jacoby-Mederios- Functional Classification

  6. ESBL Pandemics Enterobacteriaceae pan-resistance endemic KPC detected NDM detected. pAmpC detected

  7. ESBL (Extended spectrum β-lactamase) Out With The Old and In With The New! • Old ESBLs - SHV (SulfHydryl Variable) and TEM (Temoneira) • >120 variants • TEM and SHV-1 (initially only hydrolyzed ampicillin) first described in 1960’s • First ESBLs • SHV-2 in 1983 • TEM-3 in 1984 • TEM and SHV are primarily healthcare associated • Competitive disadvantage outside of a healthcare setting • Require administration of antibiotics to compete • More reactive against ceftazidime than cefotaxime • Rarely carbapenem resistant • New ESBLs – CTX-M (CefoTaXime –Munich) • First described in Japan in 1986 and named in Germany in 1989. • Can show carbapenem resistance, especially in association with a porin mutation

  8. CTX-M • CTX-M -lactamases are extended-spectrum β-lactamases (ESBLs) that mainly inactivate cefotaxime and cefriaxone and have less activity against ceftazidime • Sequencing evidence that gene mobilized from Kluyvera spp. (environmental bacteria rarely associated with disease) • Associated with community-acquired UTIs • Highest incidence in E. coli • Plasmid is stable and confers minimal competitive disadvantage when β-lactams are not present • Dramatic world-wide spread in the last decade • Quickly replacing TEM- and SHV-type ESBLs • Detected in both humans and animals (in the food chain) • Present wherever β-lactam antibiotics are used • Associated with other multidrug-resistant genes • Found on plasmids that also include resistance genes to aminoglycosides and fluoroquinolones

  9. ANTIBIOGRAMS 2008 - NEW MORE AGGRESSIVE E. COLI STRAIN ESBL POSITIVE ANTIBIOGRAMS E. coli ESBL Isolates Total = 619 • Unusual resistance pattern • ESBL • Aminoglycoside resistance • Tobramycin more resistant than Gentamicin • Flouroquinolone resistance Cipro = Levo

  10. UROPATHOGENIC E. COLI ST131 MULTIPLE RESISTANCE GENES AND VIRULENCE FACTORS - ALL COMMUNITY ACQUIRED Multiple genes International Journal of Antimicrobial Agents, accepted for publication 2010.

  11. CTX-M Summary Uropathogenic E. coli clone ST131 from phylogenetic group B2 that have plasmids that produce multiple resistance factors • CTX-M-15 or CTX-M-14 • CTX-M-15 is also resistant to Ceftazidime • Different epidemiology – multidrug resistant community onset UTIs • AAC (6’)-lb-cr aminoglycoside/fluoroquinolone acetyltransferase (ACC (6’)-Ib responsible for resistance to kanamycin, tobramycin and amikacin. ACC (6’)-Ib-cr also confers resistance to ciprofloxicin and norfloxicin) • Aminoglycoside modifying enzyme that can also cause quinolone resistance, esp. in norfloxicin and ciprofloxicin (also see resistance to levofloxicin) Common cause of UTIs in the Chicago area by ESBL-producing E. coli. Bacteria with multiple resistance genes becoming widespread

  12. AmpC detection – differentiate from carbpenemase producers

  13. AmpC • Chromosomal = MY SPACE bugs • (Morgenella, Y. enterocolitica, Serratia, Providencia, Aeromonas, Citrobacter, Enterobacter) • Inducible = Any MYSPACE containing AmpC plasmid • Organism may develop resistance during prolonged therapy with 3rd generation cephalosporins. • Identified in organisms exhibiting the following: • Resistant to cephamycins • Cefoxitin and Cefotetan • Resistant to penicillin – β-lactam inhibitors • Sensitive to cefepime and carbapenems • Hyperproduction = Any Enterobacteriaceae • Caused by a mutation in the AmpC regulator gene leading to permanent (?) hyperproduction or derepression. • Increased AmpC production and proin mutation can result in carbapenem resistance

  14. pAmpC • AmpC enzymes in the midwest • C. freundii cluster • CMY-2 • Enterobacter cluster • MIR-1, ACT-1 • M. morganii cluster** • DHA-1 • plasmid-encoded inducible cephalosporinase, other plasmid-encoded AmpC enzymes are almost always expressed constitutively • H. alvei cluster • ACC-1 • Aeromonas cluster • CMY-1 and FOX-1

  15. Detection of AmpC Hyperproducer Cephamycin – inducible AmpC Inducible AmpC Cefotetan + cloxacillin Cefotetan Hyperproduction of AmpC > 3 mm difference Hyperpoduction associated with a mutation Of the AmpC regulator gene. Cephalosporinase not regulated and AmpC produced at higher levels Meropenem + Cloxacillin Meropenem + Boronic acid Meropenem

  16. AmpC + Porin Loss = Carbapenem Resistance Porins - Protein channels through bacterial membrane allow for exchange of water, ions, glucose, and other nutrients as well as waste products

  17. AmpC Summary • Gene can be found on plasmids • No longer restricted to MYSPACE bacteria • Morgenella, Y. enterocolitica, Serratia, Providencia, Aeromonas, Citrobacter, Enterobacter • Different AmpC genes with differing ranges • DHA-1 can hydrolyze carbapenems • Carbapenem resistance usually requires overexpression of AmpC (mutation in the regulator gene) and the presence of a porin mutation, restricting migration of antibiotic into the bacteria

  18. Carbapenem-Resistant Enterobacteriaceae (CRE)

  19. Carbapenemases Meropenem Imipenem Doripenem Ertapenem

  20. The Rise of Carbapenemases

  21. Why are Plasmid CRE’s a Public Health Emergency • Limited treatment options for life threatening infections • Co-migrate with other resistance genes • Resistant mechanisms have transferred to plasmids • Plasmids easily spread to other bacterial species • No/few new drugs/drug classes • Rapid detection and effective infection control measures are essential to control spread

  22. IPDH New Rule - Reporting Carbapenemases • Major points: • This establishes the mechanism by which carbapenem-resistant Enterobacteriaceae (CRE) are reported to IDPH, starting Sept 1, 2013, for all Illinois healthcare facilities • Beginning September 1, 2013, reporting facilities shall report carbapenem-resistant enterobacteriaceae (e.g., E. coli, Klebsiella species, Enterobacter species, Proteus species, Citrobacter species, Serratia species, Morganella species, or Providentia species) based on laboratory test results • Laboratory tests • Molecular tests (PCR specific for carbapeneamse) • KPC PCR currently offered at Rosemont • Phenotypic test (Modified Hodge Test) specific for carbapeneamse production • Rosemont offers modified Hodge Test and ROSCO Disks – identification of KPC, MBL, hyper AmpC, and Oxa-48 carbapenemases • Phenotypic tests are too slow! • E . coli and Klebsiella species only: nonsusceptible to one of the following carbapenems: doripenem, meropenem, or imipenem and resistant to the following 3rd generation cephalosporins: ceftriaxone, cefotaxime, and ceftazidime • We use this definition for all Enterobacteriaceae • The rationale to use a registry mechanism for reporting, versus the traditional INEDSS, is to allow the database to serve as an inter-facility information exchange for patient-related CRE status. For example, a hospital IP can query the database to see if a newly admitted patient has a history of CRE. Querying is restricted to IDPH-registered personnel  with login access to the XDRO registry.

  23. Why are CREs So Important? • Invasive infections (e.g., bloodstream infections) with CRE are associated with mortality rates exceeding 40% • Carbapenem-resistant strains frequently possess additional resistance mechanisms that render them resistant to most available antimicrobials • CRE can spread rapidly in health-care settings • Enterobacteriaceae are a common cause of community infections, and CRE have the potential to move from their current niche among health-care–exposed patients into the community MMWR March 8, 2013 / 62(09);165-170

  24. Healthcare-Associated Factors * * * * * p <0.001 From: CDC webcast 3/19/09

  25. IDENTIFICATION OF CARBAPENEMASES FOUND IN THE CHICAGO/MILWAUKEE AREA # Selective increased resistance to imipenem ^ Sensitive to AZT; clavulanic Acid +, Boronic Acid and EDTA – a Hydrolysis Symbols: - +, strong hydrolysis; +/-, weak hydrolysis; -, no measureable hydrolysis b Inhibition Symbols: +, inhibition; +/-, variable inhibition among β-lactam family members; -, no inhibition NMC-A = Not MetalloCarbapenease A; SME = Serratia marcescensEnzyme; KPC = Klebsiella pneumoniae carbapenemase; IMI = imipenem hydrolyzing β-lactamase; GES = Guiana Extended Spectrum β-lactamase; NDM = New Delhi Metallo carbapenemase; IMP = active on imipenem ; VIM = Verona Integron-encoded Metallo-β-lactamase; GIM = German Imipenemase; SPM = Sao Paulo Metallo-β-lactamase; DPA= dipicolinic acid (Metallo β-lactamase inhibitor); Boronic Acid (KPC and AmpC inhibitor); Cloxacillin(AmpC inhibitor)

  26. CREs Detected in Chicago/Milwaukee Area

  27. Carbapenem Breakpoints Lowered 9/2012

  28. Effects of Lowering Carbapenem Breakpoints • Detect chromosomal carbapenemases that are not considered an infection control emergency • More SME (Serratia MarcescensEnzyme) • Carbapenems resistant and 3rd and 4th generation cephalosporins sensitive • More NMC-A (Not MetalloCarbapenemase, in Enterobacter sp.) • Carbapenems resistant and 3rd and 4th generation cephalosporins sensitive

  29. Acute care hospital Need to break the cycle! Long term Care facilities

  30. Advocate hospitals –k. pneumoniae Imipenem (% sensitive)

  31. Vital Signs: Carbapenem-Resistant Enterobacteriaceae • Enterobacteriaceae are gram-negative bacteria that can cause invasive disease but generally have been susceptible to a variety of antibiotics. • Carbapenem-Resistant Enterobacteriaceae (CRE) are Enterobacteriaceae that have become highly resistant to most or all antibiotics through several mechanisms. Carbapenem resistance, while relatively uncommon among Enterobacteriaceae (4% of Enterobacteriaceae in this study), has increased from about 1% during the past decade. CRE bloodstream infections are associated with mortality rates approaching 50%. MMWR March 8, 2013 / 62(09);165-170

  32. Vital Signs: Carbapenem-Resistant Enterobacteriaceae • CRE has now spread throughout the United States but in most areas they remain relatively uncommon; about 4% of acute-care hospitals and 18% of long-term acute-care hospitals reported at least one CRE to the National Healthcare Safety Network in the first 6 months of 2012. Nearly all patients with CRE were currently or recently treated in a health-care setting. However, CRE could spread into the community among otherwise healthy persons MMWR March 8, 2013 / 62(09);165-170

  33. Vital Signs: Carbapenem-Resistant Enterobacteriaceae • Preventing spread is important before CRE gains a foothold in more hospitals or in the community. This requiresactive (rapid) case detection and contact precautions for colonized or infected patients as well as cohorting of patients and staff; appropriate antibiotic use in all settings; and communication about infections when patients transfer. Regional and state-based approaches have been shown to be effective in reducing incidence. • Additional information is available at http://www.cdc.gov/vitalsigns MMWR March 8, 2013 / 62(09);165-170

  34. Mechanisms of Carbapenem Resistance • Non enzymatic • Modifications of outer membrane permeability • Porin loss • Allow passage molecules include water, ions, glucose, and other nutrients as well as waste products • Up regulation of efflux systems • Enzymatic • Production of carbapenem hydrolyzing β-lactamases • hyperproduction of AmpCβ-lactamases • Certain ESBLs with increased capacity to hydrolyze carbapenems • CTX-M • Production of carbapenemases • KPC, NDM-1, others • Combinations of all of the above

  35. NEED TO DISTINGUISH MECHANISMS OF CARBAPENEM RESISTANCE – WHY? • KPC (increasing numbers) • Make all penicillins, cephalosporins, inhibitor combinations, aztreonam, and carbapenems resistant • Hyper AmpC (most common) • Make all penicillins, cephalosporins, inhibitor combinations, and aztreonam Resistant • Cefepime may still be effective • Do not change carbapenem interpretations • Metallo β-lactamases (rare, but increasing) • Same as KPC, except do not change aztreonam interpretation • Other carbapenemases • Antibiotic profiles not clear

  36. Class a - KlebsiellaPneumoniaeCarbapenemase (kpc) • 1st described in 1998, 2001 in NYC • Now endemic in the Northeastern/Mid-Atlantic region of the United States • surveillance cultures of hospitals in the New York City area reporting rates of carbapenem resistance in K. pneumoniae isolates ranging up to 40% • Reported in Europe, China, Central America, South America – Since 1998 • Also reported in Pseudomonas aeruginosa (Columbia) • KPC is a class A b-lactamase (serine residue at the active site) • Confers resistance to all b-lactams including extended-spectrum cephalosporins and carbapenems • Occurs in other Enterobacteriaceae • Most commonly seen in Kliebsiella pneumoniae • Also reported in: K. oxytoca, Citrobacter freundii, Enterobacter spp., Escherichia coli, Salmonella spp., Serratia spp.,

  37. Carbapenem Resistant Enterobacteriaceae: Incidence and Risk Factors in a Community-Teaching Hospital A. Makarem, MD; P. Alvarez, MD; M. Kulkarni, MD; M. Costello, PhD; T. Chou, MPH; J. Kerridge, RN; K. Wickman, RN; J. Malow, MD BACKGROUND METHODS FIGURES DISCUSSION The study population included adults who were hospitalized in our institution (level 1 trauma community-teaching Hospital, with 551 licensed beds, 2 adult intensive care units and a neonatal intensive care unit) from July 2008 through March 2010 and had positive cultures for CRE. CRE detection: all bacteria with MIC > 1mcg/ml for any carbapenem and resistance to any 3rd generation cephalosporin are considered screen positive. These are then confirmed as CRE by modified Hodge test and Etest. Patient records were reviewed for the following: type and location of residence, presence of indwelling devices (ventilator, central line, urinary catheter, and gastrostomy tubes), recent antibiotic exposure, signs and symptoms of infection, sites of positive cultures, co-morbidities, and mortality. All CRE isolates obtained are multidrug resistant with very limited therapeutic options, and are widespread throughout the extended care facilities (ECF) in the Chicago metropolitan area. With a mortality rate of 40%, CRE may pose a real challenge unless appropriately addressed. Horizontal dissemination appears to have an important role in the emergence of CRE infections. This is supported by the fact that most patients resided in an ECF prior to admission. Furthermore, only one patient had previous exposure to a carbapenem, and all infections were acquired prior to admission except for one. Chronic illnesses and indwelling supportive devices also appear to increase the risk of acquiring CRE infections. This might be related to a decreased functional status, or possibly some degree of immunosupression, both of which have been reported as risk factors for CRE infections. A larger sample size is needed for more accurate calculations. Carbapenems are the treatment of choice for multidrug resistant Enterobacteriaceae. However, there have been increasing reports of carbapenem resistant Enterobacteriaceae (CRE), and their prevalence has increased since they were first described in 2001. CRE are resistant to almost all available antimicrobial agents. Infections with CRE have been associated with high rates of morbidity and mortality, even when treated appropriately, particularly among individuals with prolonged hospitalization and those who are critically ill and exposed to invasive devices. Outbreaks have been reported in many countries, predominately Asia and South America. In the U.S., CRE were first reported in North Carolina, with the first reported healthcare-related outbreak in New York. Since then, CRE have been reported in at least 32 states. RESULTS CONCLUSIONS • There were a total of 20 patients with 32 CRE positive cultures in our institution during the study period. • 19/20 (95%) were infected, only 1 (5%) was colonized. • Only one patient (5%) had previous carbapenem exposure. • 40% had two sites of infection with CRE. • Infection sites included urine (60%), blood (25%), wounds (15%), sputum (15%), and PEG tubes (5%). • 2/5 of bacteremic patients died (40%). • 95% had at least one type of chronic indwelling supportive device (PEG tube, urinary catheter, tracheostomy, PICC line). • 90% had at least one chronic co-morbidity. • 80% of patients with chronic indwelling urinary catheter presented with CRE in the urine.  • 30/32 CRE cultures (93.7%) were identified as K. pneumoniae while the other two isolates were E. coli and P. mirabilis. • Patients in extended care facilities are at risk for acquiring CRE. • Use of contact precautions, hand hygiene, and other infection control measures may limit the spread of CRE. • Screening for CRE should be considered in areas of high CRE endemicity. • Development of new antimicrobial agents is needed. REFERENCES 1. Rapid Spread of Carbapenem-Resistant K pneumoniae in New York City. S Bratu, MD et al. Arch Intern Med. 2005;165:1430-1435. 2. Carbapenemase-producing Enterobacteriaceae, U.S. rivers. Aubron, C., L. Poirel, R. J. Ash, and P. Nordmann. 2005. Emerg. Infect. Dis. 11: 260-264. 3. Carbapenem resistance in Klebsiella pneumoniae not detected by automated susceptibility testing. Tenover FC. Kalsi RK. Williams PP. Carey RB. Stocker S. Lonsway D. Rasheed JK. Biddle JW. McGowan JE Jr. Hanna B. Emerging Infectious Diseases. 12(8):1209-13, 2006 Aug. 4. Carbapenem-resistant Enterobacteriaceae: a potential threat. JAMA 300:2911-3 2008 5. Tigecycline for the treatment of multidrug-resistant Enterobacteriaceae: a systematic review of the evidence from microbiological and clinical studies. Journal of Antimicrobial Chemotherapy 62:895-904 2008 6. Guidance for control of infections with carbapenem-resistant or carbapenemase-producing Enterobacteriaceae in acute care facilities. Centers for Disease Control and Prevention (CDC). Morbidity & Mortality Weekly Report. 58(10):256-60, 2009 Mar 20. 7. Ventilator-associated pneumonia caused by carbapenem-resistant Enterobacteriaceae carrying multiple metallo-beta-lactamase genes. Dwivedi M. Mishra A. Azim A. Singh RK. Baronia AK. Prasad KN. Dhole TN. Dwivedi UN. Indian Journal of Pathology & Microbiology. 52(3):339-42, 2009 Jul-Sep. 8. Potential role of active surveillance in the control of a hospital-wide outbreak of carbapenem-resistant Klebsiella pneumoniae infection. Infection Control & Hospital Epidemiology 31:620-6 2010 9. Risk Factors and Outcomes Associated with Acquisition of Colistin-Resistant KPC-Producing K pneumoniae: a Matched Case-Control Study. Zarkotou et al. J. Clin. Microbiol. 2010;48:2271-2274 Represents the location of our institution Represents the residence locations of CRE positive cases

  38. 150/3206 = 4.7% Chicago area 53/3040 = 1.7% 2/2408=0.08%

  39. Figure 1. A) Worldwide geographic distribution of Klebsiellapneumoniaecarbapenemase (KPC) producers. Gray shading indicates regions shown separately: B) distribution in the United States; C) distribution in Europe; D) distribution in China. EID, Oct. 2011

  40. Current tests for carbapenemase producers • AST patterns (ACL - all carbapenems in Gram negative panels) • Gram negative panels must include doripenem, ertapenem, imipenem, and meropenem for optimal sensitivity • Modified Hodge test ( ACL - Screen if carbapenems are NS) • Lacks sensitivity (does not detect all NDM, VIM, IMI producers) and specificity (hyper AmpC producers) • Takes too long, an additional 24-48 hours • E Tests • MBL for verification of a metallo-lactamase - carbapenem +EDTA/carbapenem • Cefotetan/Cefotetan+ cloxacillin for AmpC expression • Takes too long • Rosco Disks (ACL - Classify carbapenemases) • Differentiates MBLs, from KPCs, from hyper AmpC • Low sensitivity for Oxa-48 • Takes too long • Amplified molecular methods (ACL – KPC only, so far) • Rapid • Sensitivity dependent on variation of sequences of carbapenem resistance genes • Costly?

  41. Positive for KPC Modified Hodge test ROSCO Disks

  42. Class b carbapenemase • VIM, IMP, and NDM most common • NDM more common in E. coli than KPC • Require zinc at active site for hydrolysis of the beta-lactam ring • Resistant to all beta-lactams except for aztreonam • May not be modified Hodge Test positive

  43. Class b carbapenemaseRecent Case- Patient History • 70 year old male. Visiting relatives. • History – diabetes and chronic kidney failure, on dialysis • Admitted 9/23/2012 to CMC for shortness of breath. • Cardiac surgery - Triple bypass • Complicated recovery, discharged 10/22 to Long Term Acute Care Hospital (LTACH)

  44. Laboratory Data Treated with Pip/tazo and fluconazole

  45. Laboratory Data Repeat urine culture on 10/3 was negative

  46. Fosfomycin = S

  47. Colistin Sample is MHT + Tigecycline AmpC MBL IMI IMI + EDTA

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