Triggering interventions for influenza: the ALERT algorithm

BACKGROUND

Early, accurate predictions of the onset of influenza season enable targeted implementation of control efforts. Our objective was to develop a tool to assist public health practitioners, researchers, and clinicians in defining the community-level onset of seasonal influenza epidemics.

METHODS

Using recent surveillance data on virologically confirmed infections of influenza, we developed the Above Local Elevated Respiratory Illness Threshold (ALERT) algorithm, a method to identify the period of highest seasonal influenza activity. We used data from 2 large hospitals that serve Baltimore, Maryland and Denver, Colorado, and the surrounding geographic areas. The data used by ALERT are routinely collected surveillance data: weekly case counts of laboratory-confirmed influenza A virus. The main outcome is the percentage of prospective seasonal influenza cases identified by the ALERT algorithm.

RESULTS

When ALERT thresholds designed to capture 90% of all cases were applied prospectively to the 2011-2012 and 2012-2013 influenza seasons in both hospitals, 71%-91% of all reported cases fell within the ALERT period.

CONCLUSIONS

The ALERT algorithm provides a simple, robust, and accurate metric for determining the onset of elevated influenza activity at the community level. This new algorithm provides valuable information that can impact infection prevention recommendations, public health practice, and healthcare delivery.

Expanding Roles of Healthcare Epidemiology and Infection Control in Spite of Limited Resources and Compensation

Objective.

Data on the resources and staff compensation of hospital epidemiology and infection control (HEIC) departments are limited and do not reflect current roles and responsibilities, including the public reporting of healthcare-associated infections. This study aimed to obtain information to assist HEIC professionals in negotiating resources.

Methods.

A 28-question electronic survey was sent via e-mail to all Society for Healthcare Epidemiology of America (SHEA) members in October 2006 with the use of enterprise feedback management solution software. The survey responses were analyzed using Microsoft Excel.

Results.

Responses were received from 526 (42%) of 1,255 SHEA members. Of the respondents, 84% were doctors of medicine (MDs) or doctors of osteopathy (DOs), 6% were registered nurses, and 21% had a master of public health or master of science degree. Sixty-two percent were male (median age range, 50-59 years). Their practice locations varied across the United States and internationally. Two-thirds of respondents practiced in a hospital setting, and 63% were the primary or associate hospital epidemiologist. Although 91% provided HEIC services, only 65% were specifically compensated. In cases of antimicrobial management, patient safety, employee health, and emergency preparedness, 75%-80% of respondents provided expertise but were compensated in less than 25% of cases. Of the US-based MD and DO respondents, the median range of earnings was $151,000-$200,000, regardless of their region (respondents selected salary ranges instead of specifying their exact salaries). Staffing levels varied: the median number of physician full-time equivalents (FTEs) was 1.0 (range, 1-5); only about 25% of respondents had 3 or more infection control practitioner FTEs.

Conclusions.

Most professionals working in HEIC have had additional training and provide a wide, growing range of services. In general, only traditional HEIC work is compensated and at levels much less than the time dedicated to those services. Most HEIC departments are understaffed. These data are essential to advocate for needed funding and resources as the roles of HEIC departments expand.

Caveat Emptor: The Role of Suboptimal Bronchoscope Repair Practices by a Third-Party Vendor in a Pseudo-Outbreak ofPseudomonasin Bronchoalveolar Lavage Specimens

Objective.

To describe a pseudo-outbreak associated with loose bronchoscope biopsy ports caused by inadequate bronchoscope repair practices by third-party vendors and to alert healthcare personnel to assess bronchoscope repair practices.

Design.

Outbreak investigation.

Setting.

A 925-bed tertiary care hospital in Baltimore, Maryland.

Patients.

Patients who underwent bronchoscopy with certain bronchoscopes after they had been repaired by a third-party vendor.

Methods.

An epidemiologic investigation was conducted to determine the cause ofPseudomonas putidagrowth in 4 bronchoalveolar lavage (BAL) specimens within a 3-day period in May 2008. All bronchoscopes were inspected, and cultures were obtained from bronchoscopes and the environment. Bronchoscope cleaning and maintenance practices were reviewed. Microbiologic results from BAL specimens and medical records were reviewed to find additional cases.

Results.

All 4 case patients had undergone bronchoscopy with one of 2 bronchoscopes, both of which had loose biopsy ports. Bronchoscope cultures grewP. putida, Pseudomonas aeruginosa,andStenotrophomonas.TheP. putidastrains from the bronchoscopes matched those from the patients. Specimens from 12 additional patients who underwent bronchoscopy with these bronchoscopes grewP. putida, P. aeruginosa,orStenotrophomonas.No patients developed clinical signs or symptoms of infection, but 7 were treated with antibiotics. Investigation revealed that the implicated bronchoscopes had been sent to an external vendor for repair; examination by the manufacturer revealed irregularities in repairs and nonstandard part replacements.

Conclusions.

Third-party vendors without access to proprietary information may contribute to mechanical malfunction of medical devices, which can lead to contamination and incomplete disinfection.

Infect Control Hosp Epidemiol2012;33(3):224-229

Infection Prevention Considerations Related to New Delhi Metallo-β-Lactamase Enterobacteriaceae A Case Report

A 60-year-old American man who was hospitalized in India for 4 weeks after an intracranial bleed was transferred by air ambulance to a 249-bed community hospital in Maryland in January 2011. His clinical course is described elsewhere. Here, we describe the infection prevention considerations surrounding his care in the hospital. A sputum sample obtained from the patient grew a New Delhi metallo-β-lactamase-producing (NDM) Klebsiella pneumoniae (NDM-KP) strain and panresistant Acinetobacter species, among other pathogens. Two weeks later, a perirectal swab sample grew an NDM-1 Salmonella Senftenberg (NDM-SS) isolate, described elsewhere. Gut decolonization was attempted with rifaximin 300 mg every 12 hours for 12 days. The patient was discharged home 4.5 months later. He was readmitted to the hospital within 1 week and died shortly thereafter.

In recognition of his epidemiological risk factors, empiric contact isolation was instituted by the infectious disease physician who was consulted when the patient experienced a fever 24 hours after hospital admission. Once the NDM-KP strain was identified, a 1:1 nursing protocol was instituted for the patient; respiratory therapists, however, continued to care for other Patients. The patient's nurses were empowered to enforce strict contact isolation. Visitors were restricted to the patient's immediate family members. The hospital implemented an intensive education and communication program for the professional staff, nurses, respiratory therapists, ancillary personnel, and the patient's family.

Postexposure Prophylaxis Against Varicella-Zoster Virus Infection Among Recipients of Hematopoietic Stem Cell Transplant: Unresolved Issues

Recent guidelines for the prevention of opportunistic infections have addressed a variety of issues germane to recipients of hematopoietic stem cell transplant. However, there are several issues regarding postexposure prophylaxis against varicella-zoster virus that remain unresolved. We address these questions and offer several consensus recommendations.

Prevalence of the Use of Central Venous Access Devices Within and Outside of the Intensive Care Unit: Results of a Survey Among Hospitals in the Prevention Epicenter Program of the Centers for Disease Control and Prevention

Objective:

To determine the prevalence of central venous catheter (CVC) use among patients both within and outside the ICU setting.

Design:

A 1-day prevalence survey of CVC use among adult inpatients at six medical centers participating in the Prevention Epicenter Program of the CDC. Using a standardized form, observers at each Epicenter performed a hospital-wide survey, collecting data on CVC use.

Setting:

Inpatient wards and ICUs of six large urban teaching hospitals.

Results:

At the six medical centers, 2,459 patients were surveyed; 29% had CVCs. Among the hospitals, from 43% to 80% (mean, 59.3%) of ICU patients and from 7% to 39% (mean, 23.7%) of non-ICU patients had CVCs. Despite the lower rate of CVC use on non-ICU wards, the actual number of CVCs outside the ICUs exceeded that of the ICUs. Most catheters were inserted in the subclavian (55%) or jugular (22%) site, with femoral (6%) and peripheral (15%) sites less commonly used. The jugular (33.0% vs 16.6%; P < .001) and femoral (13.8% vs 2.7%; P < .001) sites were more frequently used in ICU patients, whereas peripherally inserted (19.9% vs 5.9%; P < .001) and subclavian (60.7% vs 47.3%; P < .001) catheters were more commonly used in non-ICU patients.

Conclusions:

Current surveillance and infection control efforts to reduce morbidity and mortality associated with bloodstream infections concentrate on the high-risk ICU patients with CVCs. Our survey demonstrated that two-thirds of identified CVCs were not in ICU patients and suggests that more efforts should be directed to patients with CVCs who are outside the ICU.

Infection Prevention Promotion Program Based on the PRECEDE Model: Improving Hand Hygiene Behaviors among Healthcare Personnel

Background.

Healthcare-associated infections (HAIs) result in significant morbidity and mortality. Hand hygiene remains a cornerstone intervention for preventing HAIs. Unfortunately, adherence to hand hygiene guidelines among healthcare personnel is poor.

Objective.

To assess short- and long-term effects of an infection prevention promotion program on healthcare personnel hand hygiene behaviors.

Design.

Time series design.

Setting

Our study was conducted at a tertiary care academic center.

Participants.

Hospital healthcare personnel.

Methods.

We developed a multimodal program that included a multimedia communications campaign, education, leadership engagement, environment modification, team performance measurement, and feedback. Healthcare personnel hand hygiene practices were measured via direct observations over a 3-year period by “undercover” observers.

Results.

Overall hand hygiene compliance increased by 2-fold after full program implementation (P<.001), and this increase was sustained over a 20-month follow-up period (P< .001). The odds for compliance with hand hygiene increased by 3.8-fold in the 6 months after full program implementation (95% confidence interval, 3.53–4.23; P< .001), and this increase was sustained. There was even a modest increase at 20 months of follow up. Hand hygiene compliance increased among all disciplines and hospital units. Hand hygiene compliance increased from 35% in the first 6 months after program initiation to 77% in the last 6 months of the study period among nursing providers (P<.001), from 38% to 62% among medical providers (P<.001), and from 27% to 75% among environmental services staff (P<.001).

Conclusions.

Implementation of the infection prevention promotion program was associated with a significant and sustained increase in hand hygiene practices among healthcare personnel of various disciplines.

Infect Control Hosp Epidemiol 2012;33(2):144-151

Effect of Accounting for Multiple Concurrent Catheters on Central Line–Associated Bloodstream Infection Rates: Practical Data Supporting a Theoretical Concern

Background.

Central line-associated bloodstream infection (CLABSI) rates are gaining importance as they become publicly reported metrics and potential pay-for-performance indicators. However, the current conventional method by which they are calculated may be misleading and unfairly penalize high-acuity care settings, where patients often have multiple consurrent central venous catheters (CVCs).

Objective.

We compared the conventional method of calculating CLABSI rates, in which the number of catheter-days is used (1 patient with n catheters for 1 day has 1 catheter-day), with a new method that accounts for multiple concurrent catheters (1 patient with n catheters for 1 day has n catheter-days), to determine whether the difference appreciably changes the estimated CLABSI rate.

Design.

Cross-sectional survey.

Setting.

Academic, tertiary care hospital.

Patients.

Adult patients who were consecutively admitted from June 10 through July 9, 2009, to a cardiac-surgical intensive care unit and a surgical intensive and surgical intermediate care unit.

Results.

Using the conventional method, we counted 485 catheter-days throughout the study period, with a daily mean of 18.6 catheter-days (95% confidence interval, 17.2-20.0 catheter-days) in the 2 intensive care units. In contrast, the new method identified 745 catheter-days, with a daily mean of 27.5 catheter-days (95% confidence interval, 25.6-30.3) in the 2 intensive care units. The difference was statistically significant (P < .001). The new method that accounted for multiple concurrent CVCs resulted in a 53.6% increase in the number of catheter-days; this increased denominator decreases the calculated CLABSI rate by 36%.

Conclusions.

The undercounting of catheter-days for patients with multiple concurrent CVCs that occurs when the conventional method of calculating CLABSI rates is used inflates the CLABSI rate for care settings that have a high CVC burden and may not adjust for underlying medical illness. Additional research is needed to validate and generalize our findings.

Politically Incorrect: Legislation Must Not Mandate Specific Healthcare Epidemiology and Infection Prevention and Control Practices

In this issue of the journal, Dr. Farr offers his perspective on the recent position statement from the Joint SHEA and APIC Task Force regarding legislative mandates for use of active surveillance cultures to screen for methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE). The position statement specifically addresses the issue of whether the use of MRSA and VRE surveillance cultures in healthcare settings should be mandated by legislation. It does not attempt to address whether or not, when, or for whom active surveillance cultures should be performed. A broad range of experts and the Boards of Directors of the Society for Healthcare Epidemiology (SHEA) and the Association of Professionals in Infection Control (APIC) reviewed this position statement, which summarizes the effectiveness of active surveillance culturing as it pertains to potential legislation. Both Boards agree the position statement represents a well-reasoned, systematic, and fair review of the literature. Of course, no single document, group, or individual should ever be viewed as having the final word on this or any subject. Thoughtful debate regarding the scientific evidence, when conducted in a professional and constructive manner, is a critical and necessary step in the translation of research and clinical observations into bedside practices. Such debate should also lead to a research agenda that will help fill gaps in knowledge that become apparent in the discussion.

Strategies to Prevent Transmission of Methicillin-ResistantStaphylococcus aureusin Acute Care Hospitals

Previously published guidelines are available that provide comprehensive recommendations for detecting and preventing healthcare-associated infections (HAIs). Our intent in this document is to highlight practical recommendations in a concise format to assist acute care hospitals in their efforts to prevent transmission of methicillin-resistantStaphylococcus aureus(MRSA). Refer to the Society for Healthcare Epidemiology of America/Infectious Diseases Society of America “Compendium of Strategies to Prevent Healthcare-Associated Infections” Executive Summary, Introduction, and accompanying editorial for additional discussion.

1. Burden of HAIs caused by MRSA in acute care facilities

a. In the United States, the proportion of hospital-associatedS. aureusinfections that are caused by strains resistant to methicillin has steadily increased. In 2004, MRSA accounted for 63% ofS. aureusinfections in hospitals.

b. Although the proportion ofS. aureus–associated HAIs among intensive care unit (ICU) patients that are due to methicillin-resistant strains has increased (a relative measure of the MRSA problem), recent data suggest that the incidence of central line–associated bloodstream infection caused by MRSA (an absolute measure of the problem) has decreased in several types of ICUs since 2001. Although these findings suggest that there has been some success in preventing nosocomial MRSA transmission and infection, many patient groups continue to be at risk for such transmission.

c. MRSA has also been documented in other areas of the hospital and in other types of healthcare facilities, including those that provide long-term care.

Blood Concentrations of Chlorhexidine in Hospitalized Children Undergoing Daily Chlorhexidine Bathing

We collected serial blood samples from children in the intensive care unit who underwent daily bathing with 2% Chlorhexidine gluconate (CHG)-impregnated cloths. Low concentrations of CHG were detected in a few blood samples, indicating absorption through intact skin. There was no suggestion that CHG accumulated in the blood with repeated exposures.

The Ability of Hospital Ventilation Systems to FilterAspergillusand Other Fungi Following a Building Implosion

Objectives:

To assess the ability of hospital air handling systems to filterAspergillus, other fungi, and particles following the implosion of an adjacent building; to measure the quantity and persistence of airborne fungi and particles at varying distances during a building implosion; and to determine whether manipulating air systems based on the movement of the dust cloud would be an effective strategy for managing the impact of the implosion.

Design:

Air sampling study.

Setting:

A 976-bed teaching hospital in Baltimore, Maryland.

Methods:

Single-stage impactors and particle counters were placed at outdoor sites 100, 200, and 400 m from the implosion and in five locations in the hospital: two oncology floors, the human immunodeficiency virus unit, the cardiac surgical intensive care unit, and the ophthalmology unit. Air handling systems would operate normally unless the cloud approached the hospital.

Results:

Wind carried the bulk of the cloud away from the hospital.Aspergilluscounts rose more than tenfold at outdoor locations up to 200 m from the implosion, but did not increase at 400 m. Total fungal counts rose more than sixfold at 100 and 200 m and twofold at 400 m. Similar toAspergillus, particle counts rose several-fold following the implosion at 100 and 200 m, but did not rise at 400 m. No increases in any fungi or particles were measured at indoor locations.

Conclusion:

Reacting to the movement of the cloud was effective, because normal operation of the hospital air handling systems was able to accommodate the modest increase inAspergillus, other fungi, and particles generated by the implosion.Aspergillusmeasurements were paralleled by particle counts.

Evaluation of Postprescription Review and Feedback as a Method of Promoting Rational Antimicrobial Use: A Multicenter Intervention

Objective.

To evaluate the impact of postprescription review of broad-spectrum antimicrobial (study-ABX) agents on rates of antimicrobial use.

Design.

Quasi-experimental before-after study.

Setting.

Five academic medical centers.

Patients.

Adults receiving at least 48 hours of study-ABX.

Methods.

The baseline, intervention, and follow-up periods were 6 months each in 2 units at each of 5 sites. Adults receiving at least 48 hours of study-ABX entered the cohort as case-patients. During the intervention, infectious-diseases physicians reviewed the cases after 48 hours of study-ABX. The provider was contacted with alternative recommendations if antimicrobial use was considered to be unjustified on the basis of predetermined criteria. Acceptance rates were assessed 48 hours later. The primary outcome measure was days of study-ABX per 1,000 study-patient-days in the baseline and intervention periods.

Results.

There were 1,265 patients in the baseline period and 1,163 patients in the intervention period. Study-ABX use decreased significantly during the intervention period at 2 sites: from 574.4 to 533.8 study-ABX days/1,000 patient-days (incidence rate ratio [IRR], 0.93; 95% confidence interval [CI], 0.88-0.97; P = .002) at hospital В and from 615.6 to 514.4 study-ABX days/1,000 patient-days (IRR, 0.83; 95% CI, 0.79-0.88; P < .001) at hospital D. Both had established antimicrobial stewardship programs (ASP). Study-ABX use increased at 2 sites and stayed the same at 1 site. At all institutions combined, 390 of 1,429 (27.3%) study-ABX courses were assessed as unjustified; recommendations to modify or stop therapy were accepted for 260 (66.7%) of these courses.

Conclusions.

Postprescription review of study-ABX decreased antimicrobial utilization in some of the study hospitals and may be more effective when performed as part of an established ASP.

Targeted Surveillance to Identify Children Colonized with Vancomycin-Resistant Enterococcus in the Pediatric Intensive Care Unit

Performing admission surveillance cultures is a resource-intensive strategy to identify asymptomatic patients with vancomycin-resistant Enterococcus (VRE) colonization. We measured VRE prevalence among children admitted to the pediatric intensive care unit. Targeted surveillance captured 94% of VRE-colonized children and may be an effective strategy to identify VRE carriers and facilitate pediatric infection prevention strategies.

Outbreak of Multidrug-Resistant Serratia marcescens Infection in a Neonatal Intensive Care Unit

Background.

Serratia marcescens causes healthcare-associated infections and significant morbidity and mortality in neonatal intensive care units (NICUs). We report the investigation and control of an outbreak of multidrug-resistant (MDR) S. marcescens infection at an NICU.

Methods.

An outbreak investigation and a case-control study were undertaken at a 36-bed NICU in a tertiary care hospital in Baltimore, Maryland, for the period from October 2004 through February 2005. The outbreak investigation included case identification, review of medical records, environmental cultures, patient surveillance cultures, personnel hand cultures, and pulsed-field gel electrophoresis (PFGE). The case-control study included case identification and review of medical records. Infection control measures were implemented. Eighteen NICU neonates had cultures that grew MDR S. marcescens during the study period. The case-control study included 16 patients with the outbreak strain or an unidentified strain of MDR S. marcescens and 32 control patients not infected and/or colonized with MDR S. marcescens, treated in the NICU for at least 48 hours during the study period.

Results.

PFGE analysis identified a single strain of MDR S. marcescens that infected or colonized 15 patients. Two patients had unique strains, and 1 patient's isolate could not be subtyped. An unrelated MDR S. marcescens isolate was recovered from a sink drain. Exposure to inhalational therapy was an independent risk factor for MDR S. marcescens acquisition after adjusting for birth weight. Extensive investigation failed to reveal a point source for the outbreak.

Conclusion.

A single epidemic strain of MDR S. marcescens spread rapidly and threatened to become endemic in this NICU. Transient carriage on the hands of healthcare personnel or on respiratory care equipment was the likely mode of transmission. Cohorting patients and staff, at the cost of bed closures and additional personnel, interrupted transmission and halted the outbreak.

Strategies to Prevent Catheter-Associated Urinary Tract Infections in Acute Care Hospitals

Previously published guidelines are available that provide comprehensive recommendations for detecting and preventing healthcare-associated infections. The intent of this document is to highlight practical recommendations in a concise format designed to assist acute care hospitals in implementing and prioritizing their catheter-associated urinary tract infection (CAUTI) prevention efforts. Refer to the Society for Healthcare Epidemiology of America/Infectious Diseases Society of America “Compendium of Strategies to Prevent Healthcare-Associated Infections” Executive Summary and Introduction and accompanying editorial for additional discussion.

1. Burden of CAUTIs

a. Urinary tract infection is the most common hospital-acquired infection; 80% of these infections are attributable to an indwelling urethral catheter.

b. Twelve to sixteen percent of hospital inpatients will have a urinary catheter at some time during their hospital stay.

c. The daily risk of acquisition of urinary infection varies from 3% to 7% when an indwelling urethral catheter remains in situ.

2. Outcomes associated with CAUTI

a. Urinary tract infection is the most important adverse outcome of urinary catheter use. Bacteremia and sepsis may occur in a small proportion of infected patients.

b. Morbidity attributable to any single episode of catheterization is limited, but the high frequency of catheter use in hospitalized patients means that the cumulative burden of CAUTI is substantial.

c. Catheter use is also associated with negative outcomes other than infection, including nonbacterial urethral inflammation, urethral strictures, and mechanical trauma.

Staphylococcus aureusColonization Among Healthcare Workers at a Tertiary Care Hospital

We describe the epidemiology ofStaphylococcus aureuscolonization among 200 healthcare workers. The prevalence ofS. aureuswas 28%, and the prevalence of methicillin-resistantS. aureus(MRSA) was 2%. The incidence of MRSA colonization was extremely low. This study suggests that the risk of MRSA transmission to healthcare workers is low in a hospital where MRSA is endemic.

Methicillin-resistant Staphylococcus aureus transmission and infections in a neonatal intensive care unit despite active surveillance cultures and decolonization: challenges for infection prevention

OBJECTIVE

To characterize the epidemiology of methicillin-resistant Staphylococcus aureus (MRSA) transmission and infections in a level IIIC neonatal intensive care unit (NICU) and identify barriers to MRSA control.

SETTING AND DESIGN

Retrospective cohort study in a university-affiliated NICU with an MRSA control program including weekly nares cultures of all neonates and admission nares cultures for neonates transferred from other hospitals or admitted from home.

METHODS

Medical records were reviewed to identify neonates with NICU-acquired MRSA colonization or infection between April 2007 and December 2011. Compliance with hand hygiene and an MRSA decolonization protocol were monitored. Relatedness of MRSA strains were assessed using pulsed-field gel electrophoresis (PFGE).

RESULTS

Of 3,536 neonates, 74 (2.0%) had a culture grow MRSA, including 62 neonates with NICU-acquired MRSA. Nineteen of 74 neonates (26%) had an MRSA infection, including 8 who became infected before they were identified as MRSA colonized, and 11 of 66 colonized neonates (17%) developed a subsequent infection. Of the 37 neonates that underwent decolonization, 6 (16%) developed a subsequent infection, and 7 of 14 (50%) that remained in the NICU for 21 days or more became recolonized with MRSA. Using PFGE, there were 14 different strain types identified, with USA300 being the most common (31%).

CONCLUSIONS

Current strategies to prevent infections-including active identification and decolonization of MRSA-colonized neonates-are inadequate because infants develop infections before being identified as colonized or after attempted decolonization. Future prevention efforts would benefit from improving detection of MRSA colonization, optimizing decolonization regimens, and identifying and interrupting reservoirs of transmission.