Abstract
Purpose
To evaluate the impact of country socioeconomic status and hospital type on device-associated healthcare-associated infections (DA-HAIs) in neonatal intensive care units (NICUs).
Methods
Data were collected on DA-HAIs from September 2003 to February 2010 on 13,251 patients in 30 NICUs in 15 countries. DA-HAIs were defined using criteria formulated by the Centers for Disease Control and Prevention. Country socioeconomic status was defined using World Bank criteria.
Results
Central-line-associated bloodstream infection (CLA-BSI) rates in NICU patients were significantly lower in private than academic hospitals (10.8 vs. 14.3 CLA-BSI per 1,000 catheter-days; p < 0.03), but not different in public and academic hospitals (14.6 vs. 14.3 CLA-BSI per 1,000 catheter-days; p = 0.86). NICU patient CLA-BSI rates were significantly higher in low-income countries than in lower-middle-income countries or upper-middle-income countries [37.0 vs. 11.9 (p < 0.02) vs. 17.6 (p < 0.05) CLA-BSIs per 1,000 catheter-days, respectively]. Ventilator-associated-pneumonia (VAP) rates in NICU patients were significantly higher in academic hospitals than in private or public hospitals [13.2 vs. 2.4 (p < 0.001) vs. 4.9 (p < 0.001) VAPs per 1,000 ventilator days, respectively]. Lower-middle-income countries had significantly higher VAP rates than low-income countries (11.8 vs. 3.8 per 1,000 ventilator-days; p < 0.001), but VAP rates were not different in low-income countries and upper-middle-income countries (3.8 vs. 6.7 per 1,000 ventilator-days; p = 0.57). When examined by hospital type, overall crude mortality for NICU patients without DA-HAIs was significantly higher in academic and public hospitals than in private hospitals (5.8 vs. 12.5%; p < 0.001). In contrast, NICU patient mortality among those with DA-HAIs was not different regardless of hospital type or country socioeconomic level.
Conclusions
Hospital type and country socioeconomic level influence DA-HAI rates and overall mortality in developing countries.
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Introduction
Every year, >4 million neonates die in their first 28 days of life. In fact, more than one-third of all deaths in children <5 years of age occur during this neonatal period, and most die within their first 5 days of life [1]. Approximately 1.6 million neonates are estimated to die of community or healthcare-acquired infections (HAI) [2–4].
In the developing world, most births occur at home [1], and most pregnant women have no skilled attendant present during labor and delivery. Women with problem pregnancies need access to expert prenatal care. However, often that care exposes the women to unhygienic perinatal practices that increase their and their infant’s risk of HAIs.
Intensive care units (ICUs) usually receive better funding and staffing than other hospital wards; consequently, care in the ICU often represents the best care available. Little—if any—data are available on the morbidity and mortality rates among neonatal ICU (NICU) patients due to device-associated-HAIs (DA-HAIs) in developing countries.
Worldwide, the most common DA-HAI in pediatric patients is central line-associated bloodstream infections (CLA-BSIs). In a major review, Zaidi et al. [5] identified only 32 studies that reported incidence data on neonatal sepsis, infection, or CLA-BSI per 1,000 hospital born babies. Sepsis rates ranged from 6.5 to 38 per 1,000 live hospital born babies, and reported CLA-BSIs rates were as high as 68 per 1,000 live births. Most resource-poor hospitals do not have infection prevention programs nor do they conduct HAI or CLA-BSI surveillance; thus, it is difficult to estimate the true magnitude of this problem in developing countries.
The largest health disparities in the world are found in maternal and neonatal mortality rates between the industrialized countries and the poorest sections of the poorest countries [6]. In September 2000, almost all countries worldwide adopted the Millennium Declaration, which focused on global health and poverty improvement [7]. Endorsed by 189 countries, the Millennium Development Goals established eight goals to be reached by 2015, including Millennium Development Goal 4: to reduce by mortality in children <5 years of age by two-thirds [7].
Currently, there are no data on the association between either the type of hospital (e.g., public, academic, or private) or country socioeconomic level and NICU population DA-HAI rates. The goal of our study was to assess whether the socioeconomic level or hospital type influenced DA-HAI rates in NICU patients.
Methods
The International Nosocomial Infection Control Consortium (INICC) is an international, multi-center, collaborative DA-HAI surveillance system based on the U.S. Centers for Disease Control and Prevention’s (CDC) National Healthcare Safety Network [NHSN; formerly the National Nosocomial Infections Surveillance (NNIS) system] [8–11]. Founded in Argentina in 1998, INICC is the first multi-national HAI research network established to control and reduce DA-HAIs through the analysis and feedback of data collected by hospital collaborators worldwide.
Data on DA-HAI rates were collected for all NICU patients at participating hospitals from September 2003 through to February 2010 (i.e., study period) using CDC DA-HAI definitions [12, 13]. At each hospital, numerator data (i.e., patients with DA-HAIs), denominator data (i.e., device-days and patient-days) were collected. Data were prospectively collected during the study period from all patients whose stay in the NICU was ≥24 h, as previously described [8–11]. All patients were followed for 48 h after discharge from the NICUs to detect DA-HAIs acquired in the NICU but manifesting only after transfer out of the NICU. In contrast to the CDC’s NHSN, in INICC, data are collected on all NICU patients, with or without a DA-HAI. Data reported to the INICC must conform to the protocol of the selected surveillance component or module before they are entered into the central INICC database. INICC methodology includes a process for the adjudication and validation of reported HAIs, as previously described [8–11].
The device utilization ratio was calculated by dividing the total number of device-days by the total number of bed days.
Participating hospitals can either send aggregated data to INICC headquarters or, if there are personnel limitations, they can send the original data and the data are entered and aggregated for them. After quality control checks are performed, the data are entered into the INICC database. The identity of all INICC hospitals, cities, and countries is confidential, in accordance with the INICC charter.
The World Bank classifies countries into four economic strata based on 2007 gross national income per capita. These groups are: low-income countries (<$935); lower-middle-income countries ($936–3,705); upper-middle-income countries ($3,706–11,455); high-income (HI; ≥$11,456) [14]. Low-income, lower-middle-income, and upper-middle-income countries’ economies are sometimes referred to collectively as developing economies, developing countries, lower-income countries, low-resources countries, or emerging countries. These economies represent 144/209 (68.8%) countries of the world and >75% of the world population. In our study, DA-HAI rates were stratified by country socioeconomic level (e.g., low-income countries, lower-middle-income countries, or upper-middle-income countries) and by type of hospital (i.e., public, academic, and private).
Hand hygiene compliance surveillance
Hand hygiene compliance by the healthcare worker (HCW) at the ICU was monitored by the Internal Control Program (ICP) through observations of all HCWs during all working shifts. The observations consisted of 1-h randomly selected time periods and were carried out three times a week according to a specific sequence set forth in the INICC protocol. The ICP records the opportunities for hand hygiene and compliance before contact with each patient on a specific surveillance form designed by the INICC [8].
Statistical analysis
EpiInfo ver. 6.04b (CDC, Atlanta, GA) and SPSS ver. 16.0 (SPSS, Chicago, IL) software were used to conduct the data analysis.
Chi-square analyses for dichotomous variables and the t test for continuous variables were used to analyze baseline differences among rates. Relative risk (RR) ratios, 95% confidence intervals (CIs) and p values were determined for all outcomes.
Results
During the study period, data were reported from 30 NICUs (at 30 hospitals) in 15 countries in Latin America, Asia, Africa, and Europe (Table 1). Those reporting had participated in the INICC surveillance system for a mean of 12.9 ± 3.0 (standard deviation; SD) (range 1–70) months. Of the reporting NICUs, 21 (70%) collected and sent original data to INICC and nine (30%) collected and sent aggregated data. In all instances, the DA-HAI rates of original and aggregated data were similar. Of the 30 reporting NICUs, four (13%) are in low-income countries, 14 (47%) are in lower-middle-income countries, and 12 (40%) are in upper-middle-income countries; 14 (47%) are academic teaching hospitals, 11 (37%) are private hospitals, and five (17%) are public hospitals. Of the four reporting hospitals from low-income countries, three (75%) are private hospitals.
A comparison of INICC and CDC’s NHSN data revealed that ventilator-associated-pneumonia (VAP) accounted for approximately one-third of the DA-HAIs in the INICC data and for approximately one-fifth of the DA-HAIs in the NHSN; in addition, CLA-BSIs accounted for nearly 70% of the DA-HAIs in the INICC data and nearly 80% of the DA-HAIs in the NHSN. In INICC, the largest number of device-days was for central lines (61%) followed by mechanical ventilation (39.1%). When we compared device utilization ratios (DUR) in INICC versus CDC NHSN NICUs, the central line DURs (CL-DURs) were similar (0.25 vs. 0.24), whereas the mechanical ventilator DURs (MV-DURs) were lower in INICC than NHSN NICUs (0.16 vs. 0.21). Despite similar or lower NICU DURs, both the CLA-BSI and VAP rates at INICC hospitals were significantly higher than those at CDC’s NHSN hospitals (p value < 0.001 in both cases) (Table 2).
We next examined NICU CLA-BSI rates and CL-DURs by hospital type and socioeconomic status. CLA-BSIs can be reported as laboratory-confirmed BSI (LC-BI) or clinical sepsis (CSEP) using CDC definitions. Laboratory confirmation (LC-BI) was significantly more commonly reported at academic or private hospitals than at public hospitals (56 vs. 73 vs. 26%, respectively) (Table 3). The CLA-BSI rates were lower in NICUs in private hospitals than in academic ones (10.8 vs. 14.3 CLA-BSI per 1,000 catheter-days; p < 0.03), but they did not differ in public and academic hospitals (14.6 vs. 14.3 CLA-BSI per 1,000 catheter-days; p = 0.86). The CL-DUR was higher at public hospitals than at either academic or private ones [0.50 vs. 0.28 (p < 0.001) and 0.50 vs. 0.15 (p < 0.001), respectively] (Table 3). When the NICU CLA-BSI rates were assessed by socio-economic level, CLA-BSI rates in low-income countries were higher than than lower-middle-income and upper-middle-income countries [37.0 vs. 11.9 (p < 0.01) vs. 17.6 (p < 0.05) CLA-BSIs per 1,000 catheter-days, respectively]. The CL-DUR was lower at hospitals in low-income countries and significantly higher at those in lower-middle-income countries and upper-middle-income countries [0.11 vs. 0.26 (p < 0.001) vs. 0.25 (p < 0.001), respectively] (Table 4).
Our comparison of VAP rates and MV-DURs by hospital type and country socioeconomic level revealed that the MV-DUR was higher at public hospitals than either private or academic hospitals [0.33 vs. 0.14 (p < 0.001) or 0.33 vs. 0.16, p < 0.001), respectively] (Table 5). NICU VAP rates were higher in academic hospitals than in private or public ones [13.2 vs. 2.4 (p < 0.001) vs. 4.9 (p < 0.001) VAPs per 1,000 ventilator days, respectively]. The NICU MV-DUR was higher in upper-middle-income countries than in either low-income or lower-middle-income countries [0.21 vs. 0.14 (p < 0.001) or 0.21 vs. 0.14 (p < 0.001), respectively] (Table 6). The NICU VAP rate in lower-middle-income countries was higher than that in low-income countries (11.8 vs. 3.8 per 1,000 ventilator-days; p < 0.001), while there was no difference in the rates of VAP in low-income and upper-middle-income countries (3.8 vs. 6.7 per 1,000 ventilator-days; p 0.57).
We next assessed the CLA-BSI and VAP rates and DURs stratified by birth-weight category. The CL-DUR was highest in the <750 g birth-weight group, and the CLA-BSI rates were higher in the 750–1,000 vs. >2,500 birth-weight group (17.4 vs. 10.2 per 1,000 CL days; p < 0.001) (Table 7). The MV-DUR was higher in the >2,500 g birth-weight group compared with the <750 g group (11.4 vs. 4.9 per CL 1,000 days; p = 0.0125 (Table 8).
Healthcare worker hand hygiene compliance rates were higher in private hospitals than in public or academic ones [75.2 vs. 65.0% (p 0.005) vs. 60.8% (p = 0.002), respectively]. The overall rate was 65.7%.
The overall crude mortality rate for patients without a DA-HAI was 9.4%. Mortality rates for NICU patients without DA-HAIs by hospital type ranged from 5.8% (private hospitals) to 12.5% (academic and public hospitals) (p < 0.001).
DA-HAI-related mortality was 37.1% for CLA-BSIs (Table 9) and excess crude mortality was 27.7% for CLA-BSI. (Table 10). CLA-BSI crude or excess mortality rates were not different in academic and public hospitals and thus these rates were pooled. Crude excess mortality rates for CLA-BSI were not different at academic and public hospitals compared to private hospitals (25.3 vs. 10.9; p = 0.1487).
DA-HAI-related mortality was 27.3% for VAPs (Table 9), and excess crude mortality was 17.9% for VAPs (Table 10). Crude excess mortality rates for VAP were not different at academic and public hospitals compared to private hospitals (15.2 vs. 0, p = 0.4564).
The length of stay (LOS) of patients without DA-HAI did not differ in academic and public hospitals compared to private hospitals (11.4 vs. 11.8 days). The excess LOS of patients with CLA-BSI did not differ in academic or public hospitals (29.8 vs. 32.9 days). When compared to academic and public hospitals, private hospitals had a slightly lower CLA-BSI patient excess LOS of 21.1 days (Table 11). The extra LOS of patients with VAP was significantly higher in academic and public hospitals than at private hospitals (25.6 vs. 10.2 days; p < 0.01).
Discussion
Since the CDC’s Study of the Efficacy of Nosocomial Infection Control (SENIC) Programs, it has been known that integrated infection surveillance and control programs are cost effective and can reduce the incidence of DA-HAIs by at least 30% and, consequently, healthcare costs [15]. Inspired by the success of CDC’s long-standing surveillance systems (NNIS/NHSN), which has provided invaluable data on DA-HAIs and antimicrobial resistance in U.S. hospital ICUs for >30 years [16–18], we chose to focus INICC’s first efforts on the surveillance of DA-HAIs in the ICU (including NICUs) [8–11]. We felt this choice was particularly important because ICU DA-HAI surveillance addresses the healthcare setting with the most vulnerable patient population, those with the greatest invasive device exposure, and those with the highest DA-HAI rates and related morbidity and mortality.
The reported higher rates of DA-HAI from ICUs in developing countries [8, 10, 11, 19–33] may have many plausible explanations. First, most developing countries lack any legal framework, laws, or mandate requiring the establishment of DA-HAI prevention and control programs [29, 34]. In the few cases where such regulations exist— for example, in the form of national infection control guidelines—compliance usually is highly variable at best. Second, hospital accreditation in most developing countries is not required—if available at all. Third, healthcare worker hand hygiene compliance in most healthcare facilities in developing countries is as low as, or lower than, rates reported from U.S. hospitals. Fourth, the majority of hospitals in developing countries receive limited financial or administrative support, which invariably results in very limited funds for infection control personnel or programs [29, 34]. Fifth, nurse-to-patient staffing ratios in hospitals in developing countries are typically very low (i.e., more patients for each nurse), compared with hospitals in developed countries; low nurse-to-patient staffing ratios is a powerful determinant of high DA-HAI rates in ICU patients [35]. Last, the above problems are exacerbated further by overcrowding in most hospitals in the developing world, few experienced nurses, and pressing shortages of other trained healthcare personnel and supplies.
In this evaluation of DA-HAIs in INICC NICUs, we found that DA-HAI rates, specifically CLA-BSIs and VAPs, are relatively higher in NICUs in lower-middle-income countries. Stratified by type of hospital, the VAP rate was higher in academic hospitals, and the CLA-BSI rate was not different between hospital types. The DUR and DA-HAI rates were not always highly correlated. The mortality of patients without DA-HAI was higher in “academic and public hospitals” than in private ones, but the mortality of patients with CLA-BSI and VAP differ not differ according to hospital type. This latter result is probably due to insufficient data on deaths attributable to DA-HAIs in private hospitals to be able to find a statistical difference in the comparison. A limitation of this study is that in our comparison of infection rates between different countries and different types of hospitals, we did not correct the results for other risk factors.
Our data confirm that DA-HAIs in NICU patients are a large and largely unrecognized threat to patient safety in the developing world—and a far greater threat than in developed countries [33]. A previous investigation conducted in seven Brazilian NICUs showed CLA-BSI rates higher than ours: 34.9 CLA-BSI per 1,000 CL days in patients weighing <1,000 g. However, the VAP rate per 1,000 MV days in patients between 1,000 and 1,500 g was 9.2, which is not different to our rate [33]. We hope our data will be useful in convincing Ministers of Health and Directors of hospitals in developing countries of the critical importance of infection prevention and control programs. Our data complement the activities of the World Health Organization as they focus attention on the worldwide problem of DA-HAIs through patient safety efforts. Only through the recognition of the high rate of DA-HAIs in NICU patients and enhanced implementation of evidence-base prevention interventions can the safety of NICU patients throughout the world be improved.
Our data imply that DA-HAI rates are associated with the socioeconomic level of the country, and in the case of VAP, also with type of hospital. Lower-middle-income countries have higher DA-HAI rates than low-income and upper-middle-income countries. This difference may be partially explained by the fact that in the group of hospitals located in low-income countries, 75% are private hospitals; as such, INICC hospitals representing low-income countries are, in fact, hospitals with more financial and personnel resources compared to hospitals in countries with higher socioeconomic levels. Our data illustrate the impact that DA-HAIs in NICUs have on infant mortality rates in developing countries. Understanding the factors that change as the socioeconomic status of countries improves (e.g., greater device use, care of more severely ill patients, improved staffing, other enhanced resources, etc.) may be useful in enhancing DA-HAI prevention programs worldwide.
Surveillance of DA-HAIs—defining the magnitude and nature of the problem—is the first step towards reducing the risk of DA-HAIs in vulnerable hospitalized patients. The next step is to implement targeted basic infection control interventions that have been repeatedly shown to prevent DA-HAIs. Increased awareness of the risks of DA-HAIs in INICC ICUs, which has been enormously enhanced by this collaborative study [8–11], is providing the impetus for instituting positive change. To date, targeted performance feedback programs for hand hygiene compliance and central-line, ventilator, and urinary-catheter care have already reduced the DA-HAI rates in the ICUs of many consortium hospitals [36–40]. Further advances in reducing the risk of DA-HAIs in INICC hospitals will include site-specific targeted evidence-based interventions. In addition, control of antimicrobial resistance will mandate effective nosocomial infection control and a more restrictive use of anti-infectives [29].
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Acknowledgments
The authors thank the many healthcare professionals at each INICC member hospital who assisted/participated in the surveillance program in their hospital, including the surveillance nurses, clinical microbiology personnel, and the physicians and nurses providing care for the patients during the study, without whose cooperation and generous assistance this surveillance system would not be possible. The authors also thank the INICC country coordinators (Altaf Ahmed, Carlos A. Álvarez Moreno, Anucha Apisarnthanarak, Luis E. Cuéllar, Eduardo A. Medeiros, Bijie Hu, Hakan Leblebicioglu, Lul Raka, Toshihiro Mitsuda, Virgilio Bonilla Sanchez, and Yatin Mehta), and The INICC Advisory Board (Carla J. Alvarado, Gary L. French, Nicholas Graves, Dennis G Maki, Russell N Olmsted, Didier Pittet, William Rutala, and Wing Hong Seto), who have so generously supported this unique international infection control network.
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For a list of International Nosocomial Infection Control Consortium (INICC) members, see Appendix.
Appendix
Appendix
International Infection Control Consortium, listed by country alphabetically
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1.
Argentina: Sandra Guzmán (Bernal Medical Center, Buenos Aires); Alicia Kobylarz (Eduardo Oller Solano Pediatric and Maternity Hospital, Buenos Aires); Claudia Beatriz Dominguez, Gloria Ester Coria, María Elena Martinelli (Sanatorio Fleming, Mendoza).
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2.
Brazil: Luiz Fernando Baqueiro Freitas, Maria Cecilia Imori dos Santos (Hospital Santa Lydia, Ribeirao Preto); Tatiana Rodriguez, Sandra Regina Baltieri (Hospital Maternidade Santa Joana, Sao Paulo).
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3.
Colombia: Antonio Menco, Patrick Arrieta (Clínica Santa María, Sucre); María Eugenia Rodríguez Calderón (Hospital La Victoria, Bogota); Lorena Matta Cortés, Luis Fernando Rendon Campo, Hybeth Dagua (Clínica Rafael Uribe Uribe, Santiago de Cali).
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4.
Dominican Republic: Carolina Martínez de Wang, Ramona Severino, Gilda Tolari (Hospital General de la Plaza de la Salud/Universidad Iberoamericana, Santo Domingo).
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5.
El Salvador: Ana Concepción Bran de Casares, Lilian de Jesús Machuca (Hospital Nacional de Niños Benjamin Bloom, San Salvador).
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6.
India: Amit Gupta, Narinder Saini (Pushpanjali Crosslay Hospital, Ghaziabad); Arpita Dwivedy, Suvin Shetty, Sheena Binu (Dr. L H Hiranandani Hospital); Vatsal Kothari, Tanu Singhal, Sweta Shah (Kokilaben Dhirubhai Ambani Hospital, Mumbai); Deepak Govil, Namita Jaggi, Shaleen Bhatnagar (Artemis Health Institute, New Delhi).
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7.
Jordan: Najwa Khuri-bulos, Azmi Mahafzah (Jordan University Hospital, Anman).
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8.
Malaysia: Jegathesan Manikavasagam, Lian Huat Tan, Kerinjeet Kaur (Sunway Medical Centre Berhad and Monash University Sunway Campus, Petaling Jaya).
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9.
Mexico: Martha Sobreyra Oropeza (Hospital de la Mujer, Mexico).
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10.
Morocco: Naima Lamdouar Bouazzaoui, Kabiri Meryem (Children Hôspital of Rabat, Rabat).
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11.
Peru: Fernando Martín Ramírez Wong, Carmen Saman Ángeles, Zoila Díaz Tavera (Hospital María Auxiliadora, Lima); Socorro Liliana Torres Zegarra, Nazario Silva Astete, Francisco Campos Guevara, Carlos Bazan Mendoza, Augusto Valencia Ramírez, Javier Soto Pastrana (Hospital San Bartolomé, Lima).
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12.
Philippines: Regina Berba, Glenn Angelo S. Genuino, Rafael J. Consunji, Jacinto Blas V. Mantaring III (Philippine General Hospital, Manila); Victoria D. Villanueva, María Corazón V. Tolentino (St. Luke’s Medical Center, Quezon).
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13.
Tunisia: Khaldi Ammar, Asma Hamdi (Hôpital d’Enfants, Tunis).
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14.
Turkey: Davut Ozdemir, Ertugrul Guclu, Selvi Erdogan (Duzce Medical School, Duzce); Cengiz Uzun (German Hospital, Istanbul); Gulden Ersoz, Ali Kaya, Ozlem Kandemir (Mersin University, Faculty of Medicine, Mersin); Sukru Küçüködük (Ondokuz Mayis University Medical School, Samsun); Ayse Willke, Meliha Meric, Emel Azak (Kocaeli University Faculty of Medicine, Kocaeli).
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Rosenthal, V.D., Lynch, P., Jarvis, W.R. et al. Socioeconomic impact on device-associated infections in limited-resource neonatal intensive care units: findings of the INICC. Infection 39, 439–450 (2011). https://doi.org/10.1007/s15010-011-0136-2
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DOI: https://doi.org/10.1007/s15010-011-0136-2