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Dr. Sandeep Budhiraja,MD, DNB, MRCP (UK),Director, Internal Medicine,Max Healthcare
There is probably no chemotherapeuticdrug to which in suitable circumstancesthe bacteria cannot react by in some way acquiring ‘fastness’ [resistance].” —Alexander Fleming, 1946
Increasing Resistance: A Serious & Global Problem “Increasing levels of resistance to antibiotics routinely used against bacteria responsible for nosocomial infections remains a serious and growing global problem” Impact of Resistance Infections with resistant organisms results in Higher Higher Prolonged morbidity mortality hospitalization Masterton RG. Int J Antimicrob Agents. 2009 Feb;33(2):105-10
Bad Bugs It behooves us to use antibiotics judiciously and appropriately.
ESBLs (Extended spectrum β-lactamases): The main culprit ESBL: enzyme produce by bacteria to destroy all cephalosporins, penicillins & aztreonem Mainly found in Gram –ve bacteria Rajni et al. Indian J Pract Doctor 2008 : 4 Walsh TR. JAC.2007; 59:799-820
AmpC β-lactamase Klebsiella In India Co-production of E. Coli ESBL+AmpC by spp. Enterobacteriaceae = 40%Delhi, 2003 - -Chennai, 2003 24.1% 37.%Aligarh, 2003 - - AmpC also masks detection of ESBLs in Lab: Making the co-Chennai, 2005 20.8% 16.6% production even moreDelhi, 2008 56.7% 70% difficult to identify Rajni et al. Indian J Pract Doctor 2008 : 4
ESBL, OXA: Co-productionMulticenter study in 6 Indian cities in 2007 ESBL, OXA: Co-production In India bacteria are frequently co-producing OXA along with ESBL (CTX-M-15) Which are Resistant to penicillinsWalsh TR genJ cephalosporins & 3rd et al. Antimicrob Chemother 2007; 59:799–820 cephamycins & BLIs (Cefepime is sensitive)
Classification of Carbapenem-hydrolyzing beta-lactams (Carbapenemases) Class A: IMI, KPC, NMC, SME Class B: VIM, IMP, GIM, SPM Class C: OXA-23-like, OXA-24-like, OXA-49, OXA-51-like, OXA-58 Livermoe DM. Clin Microbiol Infect 2008; 14 (Suppl 1): 3-10
Increasingly being reported KPC is the most prevalent. Found in USA, Israel, Turkey, China, India, UK & Nordic countries. KPC invariably found in K.pneumoniae, although it can cross boundaries. OXA-48: mainly found in K.pneumoniae and is now reported from Turkey, China, India, and UK. MBLs have been mainly found in Pseudomonas aeruginosa, but are increasingly been reported in Enterobacteriaceae, particularly from Greece and Turkey. VIM-1/VIM-4 clusters are mainly found in K.pneumoniae.
Mechanism Organisms involved Affected Not affectedSimple beta- Almost all GNBs Ampicillin, 2/3rd gen ceph,lactamases Carbenicillin BL+BLI, Monobatam, CarbapenemESBLs E.coli, Klebsiella, Above + 2/3rd Carbapanem, Other Enterobacteriacae gen Ceph, Cephamycins, family members Monobactam Tigecycline, BL+BLIs ?Amp C & OXA SPICE bugs Above + Cefepime, BL + BLI Carbapenem, Cephamycins TigecyclineMetallo beta- S. Maltophilia, Above + Colistin,lactamases Pseudomonas, E.coli Carbapenems Tigecycline Acinetobacter,Klebsiella, Enterobacter
In February 2009 a patient feeling unwell, with restlessness, nausea and vomiting was submitted to hospital in London. One week prior to admission he had been discharged from a hospital in Curaçao where he had spent two weeks after becoming ill while on holiday; he had had no other admissions to hospital since 2007. A urinary catheter had been in situ for three weeks at the time of admission in the UK. He received medical treatment for acute renal failure, the urinary catheter was removed on day 2 of admission, no antibiotic treatment was given and he was discharged home on day 3 under the care of his general practitioner. A catheter urine specimen collected on admission grew K. pneumoniae resistant to all penicillins, cephalosporins, ertapenem and ciprofloxacin. N. Virgincar et al. / Journal of Hospital Infection 78 (2011) 293e296
The isolates were initially detected by Vitek 2 (AST-N054) using 2009 Clinical Laboratory Standards Institute (CLSI) breakpoints, which reported ertapenem as resistant, but meropenem as susceptible. However, Vitek 2’s advanced expert system (AES) interpreted meropenem as intermediate- resistant and inferred presence of carbapenemase. N. Virgincar et al. / Journal of Hospital Infection 78 (2011) 293e296
In a June 2010 update, CLSI lowered the susceptibility breakpoints to <1 mg/L for imipenem and meropenem and < 0.25 mg/L for ertapenem to better identify carbapenemase- producing Enterobacteriaceae. The EUCAST susceptibility breakpoints are still < 2 mg/L for imipenem and meropenem and < 0.5 mg/L for ertapenem. Both committees recommend performing phenotypic tests to detect carbapenemase production for infection control purposes.
What are KPCs Klebsiella pneumoniae carbapenemase’ (KPC) enzymes are an international clinical and public health concern. They belong to molecular class A carbapenemases which also include SME (Serratia marcescens enzyme), NMC/IMI (non-metallo- carbapenemase/imipenem hydrolysing b-lactamase) and GES (Guiana extended spectrum) enzymes.Emerging Infectious Diseases;www.cdc.gov/eid;Vol. 17, No. 10, October 2011
Carbapenem-resistant Enterobacteriaceae have been reported worldwide as a consequence largely of acquisition of carbapenemase genes The first carbapenemase producer in Enterobacteriaceae (NmcA) was identified in 1993 and since then, a large variety of carbapenemases has been identified in Enterobacteriaceae belonging to 3 classes of β-lactamases: the Ambler class A, B, and D β-lactamases. In addition, rare chromosome encoded cephalosporinases (Ambler class C) produced by Enterobacteriaceae may possess slight extended activity toward carbapenems, but their clinical role remains unknown.Emerging Infectious Diseases;www.cdc.gov/eid;Vol. 17, No. 10, October 2011
KPC-type enzymes in carbapenem-resistant Klebsiella pneumoniae strains were ﬁrst reported in 2001 in North Carolina.* *Antimicrob. Agents Chemother. 2001, 45:1151-1161. The ﬁrst case of KPC-producing K. pneumoniae outside the United States occurred in France, where a patient who had been hospitalized in New York carried the strain with him.** *Antimicrob. Agents Chemother. 2005, 49:4423-4424. A highly epidemic carbapenem-resistant clone of KPC- 3-producing Klebsiella pneumoniae emerged in Israel in 2006, causing a nationwide outbreak. This clone was genetically related to outbreak strains from the United States isolated in 2000 but differed in KPC-carrying plasmids. The threat of the global spread of hyperepidemic, extensively drug-resistant bacterial strains should be recognized and confronted.******ANTIMICROBIAL AGENTS AND CHEMOTHERAPY, Feb. 2009, p. 818-820
KPC confers resistance to all ß-lactams including extended-spectrum cephalosporins and carbapenems. Gene (blaKPC ) that encodes these enzymes are located on plasmids-mobile genetic elements. -increases risk transfer. Most commonly in Klebsiella pneumoniae or Escherichia coli. 2007 data from CDC regarding health care associated infections – indicated that 8% of all Klebsiella isolates were carbapenem resistant, compared with fewer than 1% in 2000.
First KPC isolated in North Carolina in 2000 2002 – First outbreak of KPC in New York 2005- cases of KPC in France 2006- First KPC producing P. Aeruginosa found in Columbia 2006- First KPC producing P. Aeruginosa found in Columbia 2007 – First KPC outbreak in Israel 2010 - blakpc-11 discovered
Multidrug resistant and even pan drug resistant(i.e. resistant to all available classes)KPC producing bacteria may be the source of therapeutic dead ends , since novel anti gram negative molecules are not expected in the near future. Careful and conservative use of antibiotics combined with good control practices is therefore mandatory.Lancet Infectious Diseases 2009;9:Pg 228-36
A novel acquired carbapenemase, New Delhi metallo-beta-lactamase 1(NDM-1), has recently been described in the United Kingdom and Sweden,mostly in patients who had received care on the Indian subcontinent. As per a survey among 29 European countries (the European UnionMember States, Iceland and Norway from 2008 to 2010,out of 77 reportedMBL cases from 13 countries.Klebsiella pneumoniae was the most frequently reported species with54%.European Centre for Disease Prevention and Control-Date 18 November 2010
By virtue of its epicentre in the huge population of India, the number of individuals affected by NDM-1– producing K. pneumoniae may already exceed that of KPC-producing K. Pneumoniae.Clin Infect Dis. 2011 February 15; 52(4): 481–484.
KPC-producing organisms have been associated with increased length of stay, costs, frequent treatment failures, and death Mortality rates of >50% have been reported Mixed reports of whether previous carbapenem use is associated with the development of infections caused by KPC producing bacteria Pharmacotherapy Rounds 2012 | Lee, G
easy plasmid transmission (KPC,NDM-1) environmental contamination may be common, unrecognized lack of good screening media difficult algorithms for detecting or confirming resistance few treatment options lack of data res: effective infection control
Advanced Age Severity of Illness Previous antibiotic treatment Organ or stem-cell transplantation Mechanical ventilation Long hospitalizations
Due to the rise in carbapenem resistance, all the isolates of K. pneumoniae and E. coli were screened for carbapenemase and Amp C production from 2009 to determine the mechanism of resistance. A total of 423 isolates (167 E. coli and 256 K. pneumoniae) were screened. More than half of the total 256 isolates of K. pneumoniae (130 isolates, 51%) were MHT positive thus carbapenemase producers. Of these, carbapenemase producers in K. pneumoniae, 103 (79%) were MBL producers .Indian Journal of Med Res 2012 Jun;135(6):907-12.
ESBL producing E. coli increased from 40 per cent in 2002 to 61 per cent in 2009, similarly there was a significant (P<0.05) rise in resistance to cefotaxime (75 to 97%), piperacillin-tazobactum (55- 84%) and carbapenem (2.4-52%) in K. pneumoniae. A significant (P<0.05) association was observed between resistance and consumption of carbapenem and piperacillin and tazobactum consumption in K. Pneumonia.Indian Journal of Med Res 2012 Jun;135(6):907-12.
Resistance to carbapenems is of great concern as carbapenems are considered to be antibiotics of last resort to combat infections by multidrug resistant bacteria, especially in ICUs and high risk wards. While carbapenem resistance in Pseudomonas and Acinetobacter spp is well known, resistance among Enterobacteriaceae is increasing. Carbapenem resistance in Enterobacteriaceae has increased from 0% in 2006 to 8% in Jan – Aug 2009 in ICU blood cultures. This is worrisome*Journal of Association of Physicians of India , March 2010 | Volume 58
August 2009 to November 2009 (3 months!!!) Single tertiary care hospital in Mumbai. 24 carbapenem resistant Enterobacteriaceae 22 were NDM producers.(90%!!) 10 were Klebsiella spp, 9 were E Coli, 2 were Enterobacter spp and 1was Morganella morganii.
Distribution of number of NDM mediated versus total number of carbapenemresistant isolates
Carbapenemases producing Enterobacteriaceae isolates seem to be increasing in number in the last few years in India The above study showed a high incidence of blaNDM among K. pneumoniae by PCR. Among the carbapenem-resistant Enterobacteriaceae isolates, NDM-1 was detected in 75% (27/36) of K. pneumoniae by PCR. Deshpande et al. reported a similar finding from a tertiary care hospital in Mumbai, in which majority of blaNDM producing isolates were K. pneumoniae. Carbapenem -resistant organisms were isolated mainly from urine samples up to 42% (n = 21), followed by wound discharge (18%) and respiratory secretions (16%). 80% (17/21) of urine isolates were positive for blaNDM , which is similar to the finding of Deshpande et al.
•We Indians are the leaders in antibiotic resistance. . •Most of the Government hospitals in India are not worried about resistance. •Our country, India, is the world leader in antibiotic resistance, in no other country antibiotics been misused to such an extent. •Indian medical community has to be ashamed of the NDM-1 (“New Delhi Metallo-1”) geneConsultant in Infectious Diseases and Clinical Mycology, Apollo Hospital, Chennai.
MIC90 for Enterobacteriaceae from Chennai and Haryana, India and the UK
Conduct surveillance study on the susceptibility patterns of KPCs Minimize the use of Carbapenems Adopt adequate infection control policies and guidelines Rationalize the antibiotic use in clinical settings Review and update hospital antibiogram from time to time Follow the guidelines as set by the Antibiotic policy of the Government of India 2011
active screening identified colonized patients who would otherwise have been missed in NYC ICUs (Calfee, Infect Control Hosp Epidemiol 2008) “bundle” (active surveillance, contact isolation, flagging, environment cleaning) (Ben-David, Infect Control Hosp Epidemiol 2010; Borer, Infect Control Hosp Epidemiol 2011) nationwide control in Israel (Schwaber, Clin Infect Dis 2011)
But what actually matters is……. •Good infection control policies •Hand-hygiene •Judicious use of antibiotics •Antibiotic protocols •Restricted use of antibiotics •Know your local flora •Audits •Strict enforcement of drug lawsOtherwise we will be creating more “Superbugs” in future