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1. Colonization and Decolonization of MRSA Ed Septimus, MD, FIDSA, SHEA, FACP
eseptimus@gmail.com
4. Carriage of S. aureus as a Risk Factor for Infection Surgery
-50 infections in 628 carriers
33 infections in 2962 noncarriers
RR 7.1 (4.6-11) Clin Microb Rev 1997; 10:505
-Orthopedics ICHE 2000; 21:319
-Cardiac J Infect Dis 1995; 171:216
5. Carriage of S. aureus as a Risk Factor for Infection Hemodialysis
-S. aureus most frequent infection at vascular site or bacteremia
-Patients on hemodialysis have ? S. aureus carriage rate
-Most S. aureus infections are endogeneous RR 1.8-4.7 if a carrier
ICHE 1994; 15:78
Am J Kidney Dis 1986; 2:281
6. Carriage of S. aureus as a Risk Factor for Infection CAPD
-S. aureus leading cause of CAPD related infections
-S. aureus nasal carriage is the major risk factor RR 1.8-14
Clin Microbiol Rev 1997; 10:505
Perit Dial Int 1996; 16:352
7. Carriage of S. aureus as a Risk Factor for Infection HIV-Positive Patient
-Increased rate of S. aureus bacteremia
-Nasal carriage is the most important risk factor OR 5.1 Ann Intern Med 1999; 130:221
-Higher carriage rate of S. aureus with progressive HIV (asymptomatic 23.5%; AIDS 50%) Eur J Clin Microbiol Infect Dis 1992; 11:985
8. Carriage of S. aureus as a Risk Factor for Infection Intravascular Device-Associated bacteremia
-Patients with an IV device who are colonized with S. aureus have a higher rate of S. aureus bacteremia RR 12.4 Am J Med 1996; 100:509
-Nasal carriage of S. aureus was identified by molecular studies to be the source of line related bacteremia N Engl J Med 2001; 344:11
9. Colonization, Fomites, and Virulence:Rethinking the Pathogenesis of CA-MRSA InfectionClin Infect Dis 2008; 46:752 CA-MRSA nasal colonization is uncommon; therefore indicating a role for noncolonization route for CA-MRSA transmission
“Five Cs” of CA-MRSA transmission
-contact (direct skin-skin contact)
-cleanliness
-compromised skin integrity
-contaminated objects and environment
-crowded living
10. Factors that Facilitate Transmission
11. Colonization, Fomites, and Virulence:Rethinking the Pathogenesis of CA-MRSA InfectionClin Infect Dis 2008; 46:752
12. Epidemiology MSSA and MRSA Reservoirs
Humans are the natural reservoirs for S. aureus. 20-50 % of healthy adults are colonized with S. aureus, and 10-20% are persistent carriers. Colonization rates are highest among patients with type 1 diabetes, IV drug users, hemodialysis, dermatologic conditions, and AIDS.
Colonized and infected patients are the major reservoir of MRSA.
13. Epidemiology continued 3. Nasal colonization with MRSA is the single most important determinant of subsequent MRSA infections
Patterns of carriage:
persistent 20% (12-30%)
intermittent 30% (16-70%)
non-carriage 50% (16-69)
J Clin Microbiol 1999;37:3133
14. Epidemiology continued 5.Persistent carriers have higher S. aureus loads and a higher risk of acquiring S. aureus infection Antimicrob Agents Chemo 1963; 161:667
J Clin Microbiol 1999; 37:3133
6.Nasal carriers who are also perineal carriers have higher S. aureus loads and disperse more S. aureus ICHE 2002; 23:495
15. Role of Nasal Carriage inS. aureus InfectionsLancet Infect Dis 2005; 5:751
17. Evaluation of a Strategy of Screening Multiple Anatomic Sites for MRSA at Admission to a Teaching HospitalInfect Control Hosp Epidemiol 2006; 27:181-184 Site % Positive
Nares 73
Rectum 47
Axilla 25
Nares+Axilla 83
Nares+Rectum 91
18. S. Aureus Intestinal Colonization Associated with Increased Frequency of S. aureus on Skin in Hospitalized PatientsBMC Infect Dis 2007; 7:105
19. Epidemiology of S. aureus Colonization in Nursing Home ResidentsClin Infect Dis 2008;46: May 1 14 community NH in MI from March 2003 to November 2004
To assess colonization with S. aureus cultures were obtained from nares, oropharynx, PEG site insertion (if present), groin, perianal, and wounds (if present)
Residents with a urinary catheter, a PEG, or central line were enrolled as the device group
An equal number of control residents without devices were randomly selected as controls
20. Epidemiology of S. aureus Colonization in Nursing Home ResidentsClin Infect Dis 2008;46: May 1
21. Throat Swabs Are Necessary to Reliably Detect Carriers of S. aureusClin Infect Dis 2007; 45:475 Samples were obtained from anterior nares and pharynx using separate swabs (2000-2005)
For culture, a selective enrichment broth was inoculated
After overnight incubation, broth was subcultured onto both chromogenic agar for S. aureus and Columbia agar
37.1% of persons were nasal carriers and 12.8% were solely throat carriers
The additional throat swab increased yield from 37% to almost 50%
0.74% were MRSA positive
22. Decolonization
23. Eradication of MRSA Colonization Systemic antimicrobials
Topical intranasal mupiricin
Bathing with CHG
Combination therapy
What sites of MRSA colonization should be targeted and does it work?
24. General Comments Short-term eradication generally successful, but most patients become recolonized later with same strain Arch Intern Med 1994; 154:1505
Most regiments seem to last up to 90 days; therefore decolonization rather than eradication is a better term Clin Infect Dis 2007; 44:186
Recolonization rates at 1 year approach 50% for healthy HCW and 75% for patients on PD
Cochrane Database Syst Rev 2003;4
J Kidney Dis 1993; 22:708
Recolonization rate at 4 months in patients on HD was 56% and recolonization rate was 71% in HIV-positive patients ASAIO J 1995; 41:127
J Infect Dis 1999; 180:896
25. Nonsurgical
26. Impact of Universal IP Surveillance and Decolonization on Rates of HA-MRSA BSI2006 IDSA Abstract # 142 Nasal PCR MRSA surveillance for all inpatients
Five-day mupiricin/CHG decolonization for carriers
In two-year pre-intervention HA-MRSA BSI was 0.57 and 0.5 per 1000 admissions respectively
Post intervention rate HA-MRSA BSI was 0.2 per 1000 admissions (P=0.02)
BSI rate for other organisms in the two-year pre-intervention was 0.9 and 0.63 per 1000 admissions and 0.63 per 1000 admissions post intervention (P=NS)
27. Reduction in Incidence of Nosocomial MRSA Infection in an ICU:Role of Treatment with Mupiricin Ointment and CHG Baths for Nasal Carriers of MRSAICHE 2006; 27:185
28. Select Use of Intranasal Mupiricin and CHG Bathing and the Incidence of MRSA Colonization and Infection Among ICU PatientsICHE 2007;28:1155
29. Effectiveness of CHG Bathing to Reduce Catheter-Associated Bloodstream Infections in MICUArch Intern Med 2007; 167:2073
30. Randomized Controlled Trial of CHG for Washing, Intranasal Mupiricin, and Rifampin and Doxycycline Versus No Treatment for the Eradication of MRSA ColonizationClin Infect Dis 2007; 44:178
31. Comments Increased mupiricin use has been associated with increased drug resistance and failure to clear S. aureus
Diagn Microbiol Infect Dis 2002; 42:283
ASC in SICU for MRSA were tested for mupiricin resistance-13.2% were resistant despite low-level in-hospital use
Clin Infect Dis 2007; 45:541
Mupiricin resistance noted in 24% of isolates and an additional 5% after treatment
Clin Infect Dis 2007; 44:178
Frequent adverse effects of systemic antimicrobial therapy with 25% of patients developing GI side effects and 5% discontinuing therapy
Clin Infect Dis 2007; 44:178
Risk of development of drug resistance especially with rifampin Antimicrob Agents Chemother 1993; 37:1334
32. Surgical
33. Nasal carriage of S. aureus has been consistently identified as a risk factor for development of postoperative surgical site infections in a large number of studies involving different populations
34. Guidelines for Prevention of Surgical Site infections (SSI), 1999Infect Control Hosp Epidemiol 1999; 20:247Mupirocin No recommendation to preoperatively apply mupirocin to nares to prevent SSI-unresolved issue
35. Randomized Trial of Prophylactic Mupiricin + CHG ShowerN Engl J Med 2002;346:1871 Nasal carriage of S. aureus eliminated in 83.4% v. 27.4% in placebo (p<0.001)
SSI 7.9% v. 8.5% (ns)
S. aureus SSI 2.3% v. 2.4% (ns)
In carriers:
-any HA staph infection (most SSI) 4% v. 7.7% (OR 7.7% 95% CI 0.25-0.92)
-84.6% PFGE match between nares and SSI
All surgical procedures combined-overall infection rate low
36. Antibiotic Prophylaxis in Cardiac Surgery, Part IISociety of Thoracic Surgeons (STS)www.sts.org February 2007 Routine mupirocin administration is recommended for all patients undergoing cardiac surgical procedures in the absence of a documented negative testing for Staphylococcal colonization (Level A)
37. Intranasal Mupiricin Reduces Sternal Wound Infect after Open Heart Surgery in Diabetics and NondiabeticsAnn Thorac Surg 2001; 71:1572 Prospective study over a 3 year period who were enrolled in two consecutive prospective groups involving use and nonuse of intranasal mupiricin
Overall sternal SSI 2.7% untreated group v. 0.9% in the treatment group (p=0.005)
Not a randomized control study
38. Prevention of Nosocomial Infection in Cardiac Surgery by Decontamination of the Nasopharynx and Oropharynx with Chlorhexidene Gluconate (CHG)JAMA 2006; 296:2460 Prospectively, randomized, double-blind, placebo controlled trial in cardiac surgery
Oropharyngeal rinse and nasal ointment containing CHG or placebo
Patients were eligible whenever prolonged ICU stay (>5 days) or prolonged ventilation (> 2 days) was expected after surgery
A significant reduction of 57.5% in S. aureus carriage compared with a reduction of 18.1% in placebo group (P<.001)
SSIs and pneumonias were significantly reduced
39. Recent LiteratureMupirocin Prophylactic intranasal mupirocin did not significantly reduce postoperative S. aureus infections (included all procedures) N Engl J Med 2002; 346:1871
Intranasal mupirocin starting day -1 to day +4 significantly decreased MRSA SSIs in orthopedic surgery J Hosp Infect 2003; 54:196
40. SSI Infections in Orthopedic SurgeryClin Infect Dis 2002; 35:353 Preoperative nasal carriage rate S. aureus was ~30%
614 patients were randomized to receive mupirocin vs. placebo
Eradication of nasal carriage was significantly more effective in the mupirocin group (83.5% vs. 27.8%)
Mupirocin did not reduce SSIs due to S. aureus significantly (3.8% mupirocin group vs. 4.7% in placebo)
In the mupirocin group, the rate of endogenous S. aureus infections was five times lower than in placebo group (ns)
Study was not powered adequately for infections
41. Recent LiteratureMupirocin cont. Perioperative intranasal mupiricin decreased SSIs in nongeneral surgery (cardiothoracic and orthopedic) but not in general surgery Infect Control Hosp Epidemiol 2005; 26:916
Intranasal mupiricin significantly reduced S. aureus SSI rates in cardiac surgery Am J Infect Control 2006; 34:44
42. Impact of Rapid Molecular Screening for MRSA in Surgical WardsBritish J Surg 2008; 95:381 In 2006, nasal swabs were obtained before surgery for all patients undergoing elective and emergency procedures by PCR
MRSA-positive patients were started on mupiricin nasal ointment and CHG body wash
Overall 4.5% were MRSA-positive
MRSA bacteremia fell by 38.5% (P<0.001)
MRSA SSIs fell 12.7% ( P=0.031)
44. Ed’s Current Recommendations Use of systemic antimicrobial agents or mupiricin to eliminate MRSA carriage is not recommended for the general patient population or for pre-op decolonization for general surgery patients.
Pre-operative decolonization may be considered for MSSA and MRSA-colonized patients about to undergo selected high-risk surgical procedures, such as CV surgery, vascular procedures with placement of a graft, prosthetic joint implantation, and neurosurgical procedures with implantation of hardware.
45. Ed’s Current Recommendationscontinued The optimal decolonization regiment is unclear, but mupiricin and CHG is reasonable.
The use of vancomycin for surgical prophylaxis for certain high-risk procedures such as CV surgery, vascular procedures with placement of a graft, prosthetic joint implantation, and nuerosurgical procedures with implantation of hardware, for patients colonized with MRSA should be considered.
46. http://hcupnet.ahrq.gov
47. Rice; J Infect Dis 2008;April 15 No ESKAPE E=Enterococcus faecium
S=Staphylococcus aureus
K=Klebsiella pneumoniae
A=Acinetobacter baumanni
P=Pseudomonas aeruginosa
E=Enterobacter species
48. Ed’s SuggestionsMDRO Adherence to evidenced-based prevention practices
-Hand washing and contact precautions
-CR-BSI bundle
-VAP bundle
-SSI bundle
-CHG bathing in ICU
Antimicrobial stewardship
Decontamination of environment and equipment
Second tier of interventions based on local epidemiology
49. Burden of HAIs in the U.S., 2002 1.7 million infections in hospitals
Most (1.3 million) were outside of ICUs
4.5 per 100 admissions
99,000 deaths associated with infection
36,000 pneumonia;
31,000 bloodstream infections To summarize results of CDC’s findings, about 1.7 million healthcare-associated infections occurred in U.S. hospitals. Of these, most (1.3 million) were outside of intensive care units. These numbers can also be presented as 9.3 infections per 1,000 patient-days, or 4.5 per 100 admissions. There were an estimated 99,000 deaths associated with these infections. The body sites associated with the greatest number of deaths were the estimated 36,000 deaths from pneumonia, and 31,000 from bloodstream infections.
In the United States, HAIs add an estimated $4.5-5.7 billion to the cost of patient care (2001 dollars).[5]To summarize results of CDC’s findings, about 1.7 million healthcare-associated infections occurred in U.S. hospitals. Of these, most (1.3 million) were outside of intensive care units. These numbers can also be presented as 9.3 infections per 1,000 patient-days, or 4.5 per 100 admissions. There were an estimated 99,000 deaths associated with these infections. The body sites associated with the greatest number of deaths were the estimated 36,000 deaths from pneumonia, and 31,000 from bloodstream infections.
In the United States, HAIs add an estimated $4.5-5.7 billion to the cost of patient care (2001 dollars).[5]
50. Problem Enhanced by Antimicrobial resistance
Emerging pathogens
Emergence of novel/virulent strains
Rapid worldwide spread
51. What It Takes to Win Engagement
Education
Execution
Evaluation
52. US Approach to Strategies in the Battle against HAI, 2006J Hosp Infect 2007; 65:3 No single intervention prevents any HAI; rather a “bundle” approach, using a package of multiple interventions based on evidence provided by the infection control community and implemented by a multidisciplinary team is the model for successful HAI prevention
Benchmarking is inadequate and a culture of zero tolerance is required
A culture of accountability and administrative support is required
53. New Belief ?New Response Change focus from infection control to infection prevention
Abandon 33% preventable target
Am J Epidemiol 1985; 121:182
Aim to eliminate all HAIs
Requires culture change
54. Essential Elements for Change Demand adherence to evidenced-based infection prevention practices
Measurement and feedback of information
Continuous learning and reflection
Collaboration and teamwork between all levels of the organization (generate light not heat)
Leadership support
Everyone held accountable for compliance
Empower all members of health care team (include patients and families) to ensure compliance
56. Good ideas are not adopted automatically.They must be driven into practice with courageous patience. Admiral Hyman Richover