outbreak of carbapenem- resistant klebsiella pneumoniae · outbreak of carbapenem-resistant...
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To protect, promote and improve the health of all people in Florida through integrated state, county, and community efforts.
Outbreak of Carbapenem-Resistant Klebsiella pneumoniae
Infection in an Acute Care Hospital – Charlotte County
Bureau of EpidemiologyGrand Rounds Presentation
September 24, 2013
Division of Disease Control and Health Protection
Jennifer Roth, MSPH Florida Epidemic Intelligence Service Fellow
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Investigation Team
• Jennifer Roth, MSPH – Florida EIS Fellow• Melanie McCall, RN, CIC – Infection Control
Nurse• Lillian Gomes, RN – Nursing Program Specialist• Ana Scuteri, MPH – Disease Control
Administrator• Scott Prichard, MPH – Regional Epidemiologist
Division of Disease Control and Health Protection2
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Objectives
• Understand Carbapenem-resistant Enterobacteriaceae (CRE) infection
• Describe the characteristics of the Charlotte County outbreak
• Examine key risk factors identified during the investigation
• Describe the infection control steps taken to stop the outbreak
• Explain recommendations to be used for future outbreaks
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What are Enterobacteriaceae?
• Rod-shaped, Gram negative bacterium in the Enterobacteriaceae family that includes: – E. coli, Klebsiella, Proteus and Citrobacter
species. • Commensal bacteria commonly found in the
human gut
Public Health Image LibraryDivision of Disease Control and Health Protection4
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Carbapenems
• Characteristics of the carbapenem family of antibiotics– ß-lactam structure similar to penicillin– Considered “drug of last resort”– Ertapenem, imipenem, meropenem,
doripenem
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Carbapenem Resistance
• Most common method of resistance is production of an enzyme that can destroy the ß-lactam ring– Klebsiella pneumoniae carbapenemase
(KPC)– New Delhi Metallo-beta-lactamase (NDM)
• Enterobacteriaceae that are carbapenem-resistant often carry genes that cause resistance to other antibiotics as well
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Background on CRE infections• 2001: CRE first identified in the United States in
North Carolina, in a case of Klebsiellapneumoniae
• As of September 2012, now identified in 43 states in various Enterobacteriaceae species
• In 2012, 4.6% of acute care hospitals reported at least one CRE infection*– 3.9% in short-stay hospitals, 17.8% in long-
stay hospitals
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Background on CRE infections
• Since March 2008, several CRE outbreaks have been reported to the FDOH– Most of these outbreaks were reported at long
term acute care hospitals (LTACH)
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Epidemiology
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States where KPC enzyme has been isolated, September 2012
http://www.cdc.gov/hai/organisms/cre/TrackingCRE.html
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CRE infections
• Primarily a health care-associated infection• Common sites of infection:
– Respiratory tract– Urinary tract– Wounds– Blood stream infections (BSI)
• Mortality rates of 30-50%
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CRE Colonization
• Bacteria found on or in the body but not causing any symptoms or disease
• CRE typically colonize the intestinal tract
• Colonization can go on to cause infection if the bacteria gain access to a normally sterile site, such as the urinary tract, lungs, or bloodstream
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CRE infectionsRisk factors:
– Failure to adhere to standard infection prevention and control practices• Hand-hygiene• Standard sterile techniques• Proper sterilization and storage of
equipment used in invasive procedures
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CRE infections
Risk Factors:– Long-term health care stays– Use of invasive devices– Long courses of antibiotics– Recent organ or stem cell transplant– ICU admission
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Laboratory MethodsDiagnosis
– Routine culture– Automated resistance testing methods
• Confirmation requires Modified Hodge test and PCR
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Antibiotic Treatment
Treatment (options limited)– Based on antibiotic sensitivity assays for
individual infections and published case series• Gentamicin• Tigecycline• Colistin
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Antibiotic Treatment
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Charlotte County Outbreak
• FDOH – Charlotte notified in October 2012 by a local acute care hospital of 8 Carbapenem-resistant Klebsiella pneumoniae (CRKP) infections during the month of September– 238-bed hospital– No previous CRKP infections detected
• Reviewed medical records of CRKP-infected patients and requested the hospital perform a retrospective review of all Enterobacteriaceaeresults
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Initial InformationInitial cases were:
– 3 Males, 5 Females– Ages 53-82– 5 pneumonia cases, 3 UTIs– All 8 cases stayed in the same unit
• Not all at the same time– All 8 cases had an endoscopy procedure
• 5 bronchoscopies• 3 Esophagogastroduodenoscopies (EGD)
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Methods
• Case definition– A patient of Hospital A with a positive culture
for any CRE• From either a clinical or surveillance
specimen • Active case finding
– Conducted through reviewing microbiology records starting from September 2011 any carbapenem-resistant Enterobacteriaceae
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Active Surveillance Cultures
• Active surveillance culture of rectal swabs was initiated in November 2012 in order to:– Identify new cases– Monitor existing cases– Determine prevalence in the facility and the
cohort unit where CRKP-infected patients stayed
– Monitor effectiveness of infection control measures
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Active Surveillance Cultures
• First performed among all inpatients to:– Assess prevalence– Initiate recommendations– Implement cohorting
• Biweekly surveillance conducted through February 2013 on cohort unit
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Investigation – Methods• FDOH staff performed walk-through of facility
– Observe infection prevention and control practices
– Unit where CRKP patients were cohorted– Endoscopy procedure rooms
• Meetings with hospital ICP, nursing staff, and environmental staff, and medical executive committee– Initial conference call between FDOH –
Charlotte, hospital staff, hospital administration, and FDOH staff
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Investigation - Methods• Retrospective review of CRKP patients’ medical
records • Community coordination and collaboration
– Retrospective and prospective lab surveillance at other local hospitals• Charlotte County Medical Administrator
requested records review in writing– Meetings with the medical society– Providing education to linked facilities
• Long-term care facilities• Rehabilitation centers
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Molecular Laboratory Methods • Pulsed-field gel electrophoresis (PFGE)
performed on all clinical isolates at the Bureau of Public Health Laboratories in Jacksonville
• PFGE creates a DNA “fingerprint” for bacteria and is unique for each strain– PFGE patterns can be compared to determine
if they are similar– Patterns that are similar or indistinguishable
between different isolates may indicate a common source, when supported by the epidemiology
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Infection Prevention and Control Interventions Implemented
• Hand-hygiene and contact precautions– Wash hands before entering and leaving a patient’s
room– Put on gown and gloves before entering patient’s
room– Use disposable devices in the room when possible– Discard gown and gloves before leaving patient’s
room• Monitor adherence and provide feedback• Promote hand hygiene and contact precautions
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Infection Prevention and Control Interventions Implemented
• Patient cohorting and dedicated staff– Cohort CRKP colonized or infected patients in
a single unit and no sharing of rooms with non-infected patients
– Dedicate nursing staff and equipment to CRKP patients
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Infection Prevention and Control Interventions Implemented
• Health care staff education– Repeated meetings with ICP and senior
nursing staff– Competency-based CRE education provided
to all nursing staff – Observation of hand washing procedures and
immediate feedback– Review of contact isolation
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Results
• 22 cases were identified from September 2012 to February 2013– 17 cases detected through clinical culture
• First positive clinical sites were urine (10), respiratory sites (6), and abscess (1)
• 3 patients progressed to BSI– 5 colonized cases detected through active
surveillance
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Results
• 7/17 cases with positive clinical culture died– 41% clinical case fatality rate– All 3 cases with BSI expired
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Epidemic Curve by First CRE Culture Date – Charlotte County,
2012-2013
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0123456789
SurveillanceClinical
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Results• Ages ranged from 21-93 years
– 20/22 patients over the age of 60 (90.9%)– Other ages: 21, 53
• 14/22 patients were female (63.6%)• 18/22 patients had an endoscopy procedure
(81.8%)– 9 bronchoscopies– 9 EGDs
• 18/22 (81.8%) received respiratory therapy
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Results• 21/22 patients had complicated medical
histories – Patients had a range of 1 to 5 admissions to
the acute care hospital prior to first CRKP culture, with a median of 2 admissions
– Prior treatment with many and various antibiotics
– Multiple comorbidities– 21-year-old patient had a CRKP-positive urine
culture collected in the ERDivision of Disease Control and Health Protection
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Results
• Most common comorbidities included:– Coronary artery and heart disease– Chronic obstructive pulmonary disease
(COPD)– Diabetes– Renal insufficiency– Cancer (lung, colon, skin, brain)– Liver cirrhosis
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Division of Disease Control and Health Protection
• 18/22 PFGE patterns weregreater than 95% similar (81.8%)
• Combined with the epidemiology, theseresults are likely to berelated
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Biweekly Point Prevalence Survey in Cohort Unit, Charlotte County – November 2012 to
June 2013
Division of Disease Control and Health Protection
0%
5%
10%
15%
20%
25%
30%
35%
40%
Poi
nt P
reva
lenc
e %
*Size of Unit = 28 beds
1st active surveillance -Prevalence 21% (n=5) End of FDOH
active investigation –Prevalence 9% (n=2)
End of hospital surveillance –Prevalence 0% (n=0)
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Discussion• This outbreak mirrored the common clinical
picture seen in other CRE outbreaks throughout the USA– Patients had prolonged hospital stays due to
complicated medical histories – Patients were exposed to many invasive and
indwelling devices– Patients were older and had many
comorbidities– Patients were previously on multiple
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Discussion• Implementing infection control measures and
active surveillance successfully reduced hospital transmission– Decreased prevalence from 20% in
November 2012 to 9% in February 2013.• Continued vigilance from the hospital resulted in
no cases identified in the June 2013 prevalent survey.
• Coordination among administration, lab and clinical staff is key to implementing, correcting, and sustaining proper adherence to infection control measures in a timely manner.
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Limitations
• Unable to locate a common source of exposure– Descriptive observations only– Difficult to design case-control study
• Multiple hospitals and long-term care facilities in the area– Past medical history was not evaluated
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Recommendations• Laboratory should have protocols for alerting
clinical and infection control staff of positive CRE cultures
• Active surveillance cultures are an important aspect to outbreak response– Point prevalence surveys useful for identifying
previously undetected cases of CRE and to measure the efficacy of infection control measures
– Screening should be based around unit and epidemiological contacts of positive CRE case
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Recommendations• In conjunction with the infection control staff,
evaluate performance of potentially high-risk procedures and perform a walk through of the facility – Identify and give immediate feedback of
possible breaks in infection control – Identify areas where cohorting could be
performed more efficiently – Reinforce the need for standard precautions
• Alert other hospitals and facilities in the area that enhanced CRE surveillance might be needed
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Recommendations• Health care facility staff infection prevention and
control education and auditing with feedback are key– Ongoing education to update staff on existing
and new developments and guidelines– Educate local medical community to be alert– Provide materials and education to other
facilities to ensure regional awareness– Inter-facility communication detailing the types
of infection the patient has is important
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Additional CDC Recommendations• Antimicrobial stewardship
– Antimicrobials are used for appropriate indications and duration
– The narrowest spectrum antimicrobial that is appropriate for the specific clinical case is used
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Additional CDC Recommendations
• Minimizing use of invasive devices– Examples such as urinary catheters, central
lines, endotracheal tubes– Device use should be observed/audited and
reviewed regularly to ensure they are still required
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Acknowledgements• Florida Department of Health – Charlotte County
– Henry Kurban, MD, MBA, MPH – Health Department Director
• Bureau of Public Health Laboratories – Paul Fiorella, PhD – Molecular Epidemiology
and Diagnostics• Florida Department of Health – Lee County• Florida Department of Health
– Katherine McCombs, MPH – EIS Administrator
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Questions?
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References• CDC. (2013, May 09). Carbapenem-resistant enterobacteriaceae (cre). Retrieved
from http://www.cdc.gov/hai/organisms/cre/ • Chitnis, A., Caruthers, P., Rao, A., & Lamb , J, et al. (2012). Outbreak of
carbapenem-resistant enterobacteriaceae at a long-term acute care hospital: sustained reductions in transmission through active surveillance and targeted interventions. Infection Control and Hospital Epidemiology, 33(10), 984-992. doi: 10.1086/667738.
• Gupta, N., Limbago, B., Patel, J., & Kallen, A. (2011). Carbapenem-resistant enterobacteriaceae:. Clinical Infectious Diseases, 53(1), 60-67.
• MMWR Weekly (2013). Vital signs: Carbapenem-Resistant Enterobacteriaceae. Centers for Disease Control and Prevention, 62(09); 165-170.
• Munoz-Price, L., De La Cuesta, C., Adams , S., & Wyckoff, M, et al. (2010). Successful eradication of a monoclonal strain of klebsiella pneumoniae during a k. pneumoniae carbapenemase-producing k. pneumoniae outbreak in a surgical intensive care unit in miami, florida. Infection Control and Hospital Epidemiology, 31(10), 1074-1077. doi: 10.1086/656243.
• Prabaker, K., Lin, M., McNally, M., & Cherabuddi, K, et al. (2012). Transfer from high-acuity long-term care facilities is associated with carriage of klebsiella pneumoniaecarbapenemase-producing enterobacteriaceae: a multihospital study. Infection Control and Hospital Epidemiology, 33(12), 1193-1199. doi: 10.1086/668435.
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