Trish M. Perl

Hospital Outbreak of Middle East Respiratory Syndrome Coronavirus

BACKGROUND In September 2012, the World Health Organization reported the first cases of pneumonia caused by the novel Middle East respiratory syndrome coronavirus (MERS-CoV). We describe a cluster of health care-acquired MERS-CoV infections. METHODS Medical records were reviewed for clinical and demographic information and determination of potential contacts and exposures. Case patients and contacts were interviewed. The incubation period and serial interval (the time between the successive onset of symptoms in a chain of transmission) were estimated. Viral RNA was sequenced. RESULTS Between April 1 and May 23, 2013, a total of 23 cases of MERS-CoV infection were reported in the eastern province of Saudi Arabia. Symptoms included fever in 20 patients (87%), cough in 20 (87%), shortness of breath in 11 (48%), and gastrointestinal symptoms in 8 (35%); 20 patients (87%) presented with abnormal chest radiographs. As of June 12, a total of 15 patients (65%) had died, 6 (26%) had recovered, and 2 (9%) remained hospitalized. The median incubation period was 5.2 days (95% confidence interval [CI], 1.9 to 14.7), and the serial interval was 7.6 days (95% CI, 2.5 to 23.1). A total of 21 of the 23 cases were acquired by person-to-person transmission in hemodialysis units, intensive care units, or in-patient units in three different health care facilities. Sequencing data from four isolates revealed a single monophyletic clade. Among 217 household contacts and more than 200 health care worker contacts whom we identified, MERS-CoV infection developed in 5 family members (3 with laboratory-confirmed cases) and in 2 health care workers (both with laboratory-confirmed cases). CONCLUSIONS Person-to-person transmission of MERS-CoV can occur in health care settings and may be associated with considerable morbidity. Surveillance and infection-control measures are critical to a global public health response.

A compendium of strategies to prevent healthcare-associated infections in acute care hospitals.

Preventable healthcare-associated infections (HAIs) occur in US hospitals. Preventing these infections is a national priority, with initiatives led by healthcare organizations, professional associations, government and accrediting agencies, legislators, regulators, payers, and consumer advocacy groups. To assist acute care hospitals in focusing and prioritizing efforts to implement evidence-based practices for prevention of HAIs, the Society for Healthcare Epidemiology of America and the Infectious Diseases Society of America Standards and Practice Guidelines Committee appointed a task force to create a concise compendium of recommendations for the prevention of common HAIs. This compendium is implementation focused and differs from most previously published guidelines in that it highlights a set of basic HAI prevention strategies plus special approaches for use in locations and/or populations within the hospital when infections are not controlled by use of basic practices, recommends that accountability for implementing infection prevention practices be assigned to specific groups and individuals, and includes proposed performance measures for internal quality improvement efforts.

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.

Approaches for Preventing Healthcare-Associated Infections: Go Long or Go Wide?

Affiliations: 1. Texas AM 2. Stroger Hospital and Rush University Medical Center, Chicago, Illinois; 3. Johns Hopkins University School of Medicine, Baltimore, Maryland; 4. Institute for Healthcare Improvement, Cambridge, Massachusetts; 5. Boston Children’s Hospital and Harvard Medical School, Boston, Massachusetts; 6. Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts. Received March 17, 2014; accepted March 18, 2014; electronically published June 9, 2014. Infect Control Hosp Epidemiol 2014;35(7):797-801 2014 by The Society for Healthcare Epidemiology of America. All rights reserved. 0899-823X/2014/3507-0003

Healthcare providers as sources of vaccine-preventable diseases.

15.00. DOI: 10.1086/676535 In this issue, the continuing “A Compendium of Strategies to Prevent Healthcare-Associated Infections in Acute Care Hospitals: 2014 Updates” series presents updated recommendations for preventing central line–associated bloodstream infections and preventing transmission and infection due to methicillin-resistant Staphylococcus aureus. During revision of these articles, several reviewers raised a critical question: What is the relative effectiveness (and cost-effectiveness) of vertical versus horizontal approaches to infection prevention? As multidrug-resistant organisms such as extendedspectrum b-lactamase–producing and carbapenem-resistant Enterobacteriaceae emerge and spread, it will become increasingly important to understand the relative benefits and costs of pathogen-specific screening and intervention strategies compared with reliable application of more “generic” methods to mitigate transmission and infection. Over the last decade, the general approaches to healthcareassociated infection (HAI) prevention have taken two conceptually different paths: (1) vertical approaches that aim to reduce colonization, infection, and transmission of specific pathogens, largely through use of active surveillance testing (AST) to identify carriers, followed by implementation of measures aimed at preventing transmission from carriers to other patients, and (2) horizontal approaches that aim to reduce the risk of infections due to a broad array of pathogens through implementation of standardized practices that do not depend on patient-specific conditions. Examples of horizontal infection prevention strategies include minimizing the unnecessary use of invasive medical devices, enhancing hand hygiene, improving environmental cleaning, and promoting antimicrobial stewardship (Table 1). Although vertical and horizontal approaches are not mutually exclusive and are often intermixed, some experts believe that the horizontal approach under usual endemic situations may offer the best overall value given the diversity of microorganisms that can cause HAIs and the constrained resources available for infection prevention efforts. When informed by local knowledge of microbial epidemiology and ecology and supported by a strong quality improvement program, this strategy allows healthcare facilities to focus on approaches that target all rather than selected organisms in the absence of an organismspecific epidemic. In addition to comparing the strength of evidence supporting each approach, it is also important to take into account financial costs and potential consequences associated with various infection prevention strategies, including the impact on hospital personnel effort and on aspects of patient care; for example, placing patients on isolation precautions may lead to fewer healthcare provider visits. These comparisons are difficult to make because of conflicting study results, at least partly reflecting the heterogeneity of study designs and settings (ie, where the prevalence of the target pathogen ranges from rare to endemic to epidemic) and the paucity of high-quality cost-effectiveness analyses that are needed to estimate the economic impact of specific HAI prevention interventions.

Healthcare-associated infections: think globally, act locally

Vaccine-preventable infectious diseases may be introduced into the healthcare setting and pose a serious risk to vulnerable populations including immunocompromised patients. Healthcare providers (HCPs) are exposed to these pathogens through their daily tasks and may serve as a reservoir for ongoing disease transmission in the healthcare setting. The primary method of protection from work-related infection risk is vaccination that protects not only an individual HCP from disease, but also subsequent patients in contact with that HCP. Individual HCPs and healthcare institutions must balance the ethical and professional responsibility to protect their patients from nosocomial transmission of preventable infections with HCP autonomy. This article reviews known cases of HCP-to-patient transmission of the most common vaccine-preventable infections encountered in the healthcare setting including hepatitis B virus, influenza virus, Bordetella pertussis, varicella-zoster virus, measles, mumps and rubella virus. The impact of HCP vaccination on patient care and current recommendations for HCP vaccination against vaccine-preventable infectious diseases are also reviewed.

Combating the spread of carbapenemases in Enterobacteriaceae: a battle that infection prevention should not lose

Healthcare-associated infections (HAIs) have been a hot topic for several decades. An understanding of HAIs should be based on an understanding of the organisms that cause infection and determine prevention. Although some improvements in control in hospitals have been recorded, the community setting is now implicated, and the role of microbiology in diagnosis, detection of carriers and strain typing of organisms is evident. As healthcare systems vary widely, prevention strategies must be designed accordingly. Hand hygiene, however, remains applicable in all settings, and the WHO is strongly promoting alcohol-based hand rubs to interrupt transmission. Some countries are only beginning to develop standards, whereas compliance is obligatory in others. Economics and cost factors are common to all countries, and litigation is increasingly a factor in some.

Preventing the soldiers of health care from becoming victims on the pandemic battlefield: respirators or surgical masks as the armor of choice.

The emergence of carbapenemases in Enterobacteriaceae has raised global concern among the scientific, medical and public health communities. Both the CDC and the WHO consider carbapenem-resistant Enterobacteriaceae (CRE) to constitute a significant threat that necessitates immediate action. In this article, we review the challenges faced by laboratory workers, infection prevention specialists and clinicians who are confronted with this emerging infection control issue.

Multidrug-resistant gram-negative bloodstream infections among residents of long-term care facilities.

The respiratory protective equipment necessary to protect health care workers from the novel swine-origin influenza A (H1N1) virus is not known. The knowledge gap created by this unanswered question has caused substantial debate and controversy on a global scale, leading public health organizations to feel pressured into issuing decisive recommendations despite a lack of supportive data. Changes in clinical practice caused by public health guidance during such high-profile events can be expected to establish a new standard of care. Also possible is an unforeseen gradual transition to widespread N95 respirator use, driven by public health pressures instead of science, for all outbreaks of influenza or influenza-like illness. Therefore, public health organizations and other influential institutions should take care to avoid making changes to established practice standards, if possible, unless these changes are bolstered by sound scientific evidence. Until definitive comparative effectiveness clinical trials are conducted, the answer to this question will continue to remain elusive. In the meantime, relying on ethical principles that have been substantiated over time may help guide public health and clinical decisions.

Variable screening and decolonization protocols for Staphylococcus aureus carriage prior to surgical procedures

OBJECTIVE Prevalence of multidrug-resistant (MDR) gram-negative (GN) bacteria is increasing globally and is complicated by patient movement between acute and long-term care facilities (LTCFs). In Asia, the contribution of LTCFs as a source of MDR GN infections is poorly described. We aimed to define the association between residence in LTCFs and MDR GN bloodstream infections (BSIs). DESIGN Secondary analysis of data from an observational cohort. SETTING Two tertiary referral hospitals in Singapore, including the 1,400-bed Tan Tock Seng Hospital and the 1,600-bed Singapore General Hospital. PARTICIPANTS Adult patients with healthcare-onset (HCO) or hospital-onset (HO) GN BSI. METHODS Patients were identified from hospital databases using standard definitions. Risk factors for both MDR GN HCO and HO BSI were analyzed using a multivariable logistic regression model. RESULTS A total of 675 episodes of GN BSI occurred over a 31-month period. Residence in a LTCF was an independent risk factor for developing MDR GN BSI (odds ratio [OR], 5.1 [95% confidence interval (CI), 2.2-11.9]; P < .01) when antibiotics were not used within the preceding 30 days. This risk persisted beyond the first 48 hours of hospitalization (OR, 3.4 [95% CI, 1.3-9.0]; P = .01). Previous culture growing an MDR organism (OR, 1.8 [95% CI, 1.3-2.7]; P < .01), previous antibiotic use (OR, 1.8 [95% CI, 1.2-2.6]; P < .01), and intensive care unit stay (OR, 2.2 [95% CI, 1.2-3.9]; P = .01), increased the risk of MDR GN BSI. CONCLUSIONS Residence in a LTCF is an independent risk factor for MDR GN BSI. Attempts to contain MDR GN bacteria in large Asian cities, where the proportion of the population that is elderly is projected to increase, should include infection prevention strategies that engage LTCFs.