Pseudomonas aeruginosa ventricular assist device infections: findings from ineffective phage therapies in five cases.

Left ventricular assist devices (LVAD) are increasingly used for management of heart failure; infection remains a frequent complication. Phage therapy has been successful in a variety of antibiotic refractory infections and is of interest in treating LVAD infections. We performed a retrospective review of four patients that underwent five separate courses of intravenous (IV) phage therapy with concomitant antibiotic for treatment of endovascular Pseudomonas aeruginosa LVAD infection. We assessed phage susceptibility, bacterial strain sequencing, serum neutralization, biofilm activity, and shelf-life of phage preparations. Five treatments of one to four wild-type virulent phage(s) were administered for 14-51 days after informed consent and regulatory approval. There was no successful outcome. Breakthrough bacteremia occurred in four of five treatments. Two patients died from the underlying infection. We noted a variable decline in phage susceptibility following three of five treatments, four of four tested developed serum neutralization, and prophage presence was confirmed in isolates of two tested patients. Two phage preparations showed an initial titer drop. Phage biofilm activity was confirmed in two. Phage susceptibility alone was not predictive of clinical efficacy in P. aeruginosa endovascular LVAD infection. IV phage was associated with serum neutralization in most cases though lack of clinical effect may be multifactorial including presence of multiple bacterial isolates with varying phage susceptibility, presence of prophages, decline in phage titers, and possible lack of biofilm activity. Breakthrough bacteremia occurred frequently (while the organism remained susceptible to administered phage) and is an important safety consideration.

Preceding Clinical Events in High-risk, Postoperative, Pediatric Cardiac Patients-A Novel Association With Bacteremia.

Objective: Blood stream infections (BSIs) are well described in pediatric cardiac intensive care units (PCICU). We noted that postoperative high-risk patients may develop BSI after a preceding clinical event (PCE). The study aim was to investigate whether high-risk patients who developed bacteremia experienced more PCEs than a similar group of high-risk patients. Design: Retrospective case-control study. Setting: Referral pediatric center. Patients: We enrolled patients who developed bacteremia from March 2010 to November 2019, after undergoing open-heart surgery at a pediatric center. The control group was comprised of case-matched patients with immediate consecutive same surgery. Interventions: None. Measurements: We recorded operative data, common risk factors, postoperative indicators of organ dysfunction, mortality, and PCEs 72 to 24 h before bacteremia emerged. Main results: A total of 200 patients were included (100 with bacteremia and 100 controls). Key demographic and operative parameters were matched. Bacteremia emerged on average on postoperative day 12.8. Skin-associated Gram-positive bacteria were cultured in 10% and Gram-negative bacteria in 84% of the patients. Average central-venous lines (CVL) duration was 9.5 ± 8.4 days. Postoperatively (72 h), indicators of organ dysfunction were significantly worse in patients with bacteremia, with a higher rate of postoperative complications during PCICU length-of-stay (LOS). In the bacteremia group, 72 to 24 h prior to the development of bacteremia, 92 (92%) PCEs were recorded, as compared to 21 (21%) in controls during their entire LOS (odds ratio [OR] 43.3, confidence interval [CI] 18.2-103.1, P < .0001). Conclusions: We propose a 3-hit model demonstrating that high-risk patients undergoing open-heart surgery have significantly higher risk for bacteremia after a PCE.

The Effect of the COVID-19 Pandemic on Pediatric Respiratory Hospitalizations.

BACKGROUND: During coronavirus disease 2019 (COVID-19) pandemic, less isolation of common winter viruses was reported in the southern hemisphere. OBJECTIVES: To evaluate annual trends in respiratory disease-related admissions in a large Israeli hospital during and before the pandemic. METHODS: A retrospective analysis of medical records from November 2020 to January 2021 (winter season) was conducted and compared to the same period in two previous years. Data included number of admissions, epidemiological and clinical presentation, and isolation of respiratory pathogens. RESULTS: There were 1488 respiratory hospitalizations (58% males): 632 in 2018-2019, 701 in 2019-2020, and 155 in 2020-2021. Daily admissions decreased significantly from a median value of 6 (interquartile range [IQR] 4-9) and 7 per day (IQR 6-10) for 2018-2019 and 2019-2020, respectively, to only 1 per day (IQR 1-3) in 2020-2021 (P-value < 0.001). The incidence of all respiratory viruses decreased significantly during the COVID-19 pandemic, with no hospitalizations due to influenza and only one with respiratory syncytial virus. There was also a significant decline in respiratory viral and bacterial co-infections during the pandemic (P-value < 0.001). CONCLUSIONS: There was a significant decline in pediatric respiratory admission rates during the COVID-19 pandemic. Possible etiologies include epidemiological factors such as mask wearing and social distancing, in addition to biological factors such as viral interference. A herd protection effect of adults and older children wearing masks may also have had an impact.

COVID-19 infection in pediatric patients treated for cancer.

BACKGROUND: COVID-19, the novel coronavirus, has caused a global pandemic affecting millions of people around the world. Risk factors for critical disease in adults are advanced age and underlying medical comorbidities, including cancer. Data are sparse on the effect of COVID-19 infection on pediatric patients with cancer during their active antineoplastic therapy. The optimal management of antineoplastic treatment during COVID-19 infection in this unique population is controversial. AIM: To describe the severity and clinical course of COVID-19 infection in pediatric patients with cancer during active antineoplastic treatment and to study their course of treatment. METHODS: Clinical and laboratory data were collected from medical files of patients diagnosed with COVID-19, confirmed by polymerase chain reaction (PCR), who received active antineoplastic treatment between March 2020 and May 2021 in a large tertiary pediatric medical center. RESULTS: Eighteen patients with diverse pediatric cancers are described. They were infected with COVID-19 at different stages of their antineoplastic treatment regimen. Eight had an asymptomatic COVID-19 infection, nine had mild symptoms, and one had severe disease. All of them recovered from COVID-19 infection. Two patients experienced delays in their antineoplastic treatment; none of the other patients had delays or interruptions, including patients who were symptomatic for COVID-19. CONCLUSION: In pediatric patients with cancer who test positive for COVID-19, yet are asymptomatic or have mild symptoms, the continuance of antineoplastic therapy may be considered.

Definitive antibiotic treatment with a third-generation cephalosporin and with piperacillin-tazobactam worked well for some children with Serratia bacteraemia.

AIM: This study aimed to describe epidemiological and clinical characteristics of Serratia bacteraemia and to identify factors associated with mortality. METHODS: The microbiology database of Schneider Children's Medical Centre of Israel was examined for Serratia marcescens positive blood cultures, between January 2007 and May 2020. Demographic, clinical and microbial characteristics were analysed. RESULTS: Of the 81 patients files that met the inclusion criteria, 64 (80%) were of patients hospitalised in paediatric intensive care units. The median age was 78 days and 54% were male. In-hospitalisation mortality was 26%, 62% died under 90 days old. Underlying conditions including prematurity, congenital cardiac defects and malignancies were noted in 95% of patients. Prior to the bloodstream infections, 62% of patients underwent procedures, 64% were on ventilatory support and 77% had central lines. Thrombocytopenia and elevated C-reactive protein levels were found in 60% of the children. Twenty-eight children received definitive monotherapy as either piperacillin-tazobactam or a third-generation cephalosporin; survival rates were similar between the two antibiotic treatment groups. CONCLUSION: In our cohort, 26% died. Death was more common in young infants. Mortality was associated with hospitalisation in intensive care units and thrombocytopenia. Survival rates following definitive monotherapy were similar for patients treated with piperacillin-tazobactam and those treated with third-generation cephalosporin.

Salivary C-reactive protein-a possible predictor of serum levels in pediatric acute respiratory illness.

Identifying the etiology of an acute respiratory infection in children is a well-known challenge. In this study, we evaluated the correlation between salivary C-reactive protein (CRP) and its serum counterpart, which is known to be higher in bacterial infections but necessitates a venipuncture. Salivary and serum CRPs were measured in children with an acute respiratory illness, aged 2 months to 18 years. Pearson's correlation coefficients were used to measure correlation. Discrimination of the salivary CRP levels for predicting serum levels above 100 mg/L was calculated and compared to serum CRP levels. Sensitivity and specificity were similarly calculated. Salivary CRP was measured in 104 samples. Levels correlated significantly and positively with serum CRP levels (r = 0.670, p<0.001). Area under the curve for predicting serum CRP levels of 100 mg/L was 0.848. For a salivary CRP concentration above 32,610 ng/L, the sensitivity and specificity were 69% and 93%, respectively, for accurately predicting a serum CRP level ≥100 mg/L.Conclusions: Salivary CRP can be used in the pediatric acute setting due to its high specificity for predicting elevated serum levels without the need for venipuncture. Further studies are required to achieve higher sensitivity rates. What is known: • Salivary C-reactive protein has shown correlation to its serum counterpart, mainly in healthy children, adults, and ill neonates. What is new: • In a large population of children with acute respiratory illness, aged 2 months to 18 years, salivary C-reactive protein showed high specificity for predicting elevated serum levels, thus indicating its potential as a diagnostic tool.

The COVID-19 pandemic dramatically reduced admissions of children with and without chronic conditions to general paediatric wards.

AIM: We examined the impact of the COVID-19 pandemic on how many children were admitted to Israel's largest tertiary paediatric hospital and why they were admitted. METHODS: Israel declared COVID-19 a national emergency on 19 March 2020. This study examined daily hospital admissions to our three general paediatric wards during the COVID-19 lockdown period from 20 March to 18 April 2020. These 258 admissions were compared with the 4217 admissions from the period immediately before this, 1 February to 19 March 2020, plus 1 February to 18 April in 2018 and 2019. We also compared why patients were admitted during the study period, and any pre-existing conditions, with 638 children hospitalised during the same period in 2019. RESULTS: The mean number of daily hospitalisations during the COVID-19 lockdown period was 8.6, which was 59% lower than the 20.9 recorded during the other three periods before COVID-19. There was a significant decrease in the number of patients admitted with infectious (74%) and non-infectious (44%) aetiologies from 2019 to 2020, and these occurred among patients with (58%), and without (55%), pre-existing medical conditions. CONCLUSION: The Israeli COVID-19 lockdown had a dramatic effect on admissions to the paediatric wards of a tertiary hospital.

Benign course and clinical features of COVID-19 in hospitalised febrile infants up to 60 days old.

AIM: Minimal data exist regarding the severity of COVID-19 in febrile infants under 60 days old. This multicentre prospective study explored the clinical course and outcomes of this hospitalised patient population, as, to date, the best approach has not been specifically addressed. METHODS: This study focused on the clinical features, laboratory parameters and outcomes of febrile infants up to 60 days old who tested positive for the virus and were hospitalised in Israel from March 2020 to January 2021. The data were extracted from a real-time prospective surveillance network for COVID-19 that includes 20 of the country's 26 hospitals. RESULTS: We identified 75 febrile young infants (60% female) with COVID-19 at a median age of 28 days (range 8-56 days). Of these, 84% had an unremarkable medical history, 29% had respiratory symptoms, and 96% had a mild illness. The Rochester criteria showed that 44% were considered at high-risk for serious bacterial infections, and we found that eight infants actually had concomitant bacterial infections. Outcomes were excellent, and no complications or fatalities were reported. CONCLUSION: The excellent outcomes of young febrile infants with COVID-19 closely resembled other respiratory viral aetiologies of fever in this age group, and there were no fatalities.

Vacuum-Assisted Closure for the Treatment of Deep Sternal Wound Infection After Pediatric Cardiac Surgery.

OBJECTIVES: Vacuum-assisted closure is being increasingly used to treat deep sternal wound infection following cardiac surgery, but most of the data refer to adults. This study investigated the safety and efficacy of vacuum-assisted closure in pediatric patients. DESIGN: Retrospective file review. SETTING: Tertiary pediatric medical center. PATIENTS: All children with deep sternal wound infection treated with vacuum-assisted closure in 2003-2016. INTERVENTIONS: Epidemiological, clinical, and microbiological data were collected from the medical records. MEASUREMENTS AND MAIN RESULTS: The cohort included 50 patients (0.9% of cardiac patients operated during the study period) of median age 6.5 months (interquartile range, 2-12.75 mo; range, 1 wk to 14 yr) and median weight 5.1 kg (interquartile range, 4-9.75 kg). The most frequent heart defects were tetralogy of Fallot (22%) and ventricular septal defect (20%); 38% of patients had cyanotic heart disease. Deep sternal wound infections appeared a median of 10 days postoperatively (interquartile range, 7-14 d; range 3-100 d). Vacuum-assisted closure was applied a median of 13 days postoperatively (interquartile range, 10-18.5 d; range, 5-103 d) for a median duration of 10 days (interquartile range, 7-13.25 d; range, 1-21 d). Wound cultures were positive in 48 patients (96%); most isolates were Gram-positive (76%). The main bacterial pathogen was methicillin-susceptible Staphylococcus aureus (61%). Most patients were treated with cloxacillin for a median of 38 days (interquartile range, 28-42 d; range, 9-189 d). There were no statistically significant differences in clinical or treatment characteristics between bacteremic (56%) and nonbacteremic patients. Compared with older patients, infants less than 3 months old (36%) had a significantly longer hospitalization time (41 vs 25 d; p = 0.001) and higher Society of Thoracic Surgeons-European Association for Cardio-Thoracic Surgery Mortality Category (3 vs 2; p = 0.003). All cases except one (contact dermatitis) were uneventful. In 10 patients, wounds were closed surgically after vacuum-assisted closure. Two patients required a pectoralis flap, both treated before 2005. One of the two deaths was infection-related. CONCLUSIONS: Vacuum-assisted closure is a feasible treatment option of deep sternal wound infection after pediatric cardiac surgery and was not associated with independent morbidity.

Hospitalization for Respiratory Syncytial Virus Bronchiolitis in the Palivizumab Prophylaxis Era: Need for Reconsideration of Preventive Timing and Eligibility.

BACKGROUND: Respiratory syncytial virus (RSV)-related bronchiolitis is a common cause of morbidity in young infants. The recommendations for its passive prevention by palivizumab are currently under intensive debate. OBJECTIVES: To elucidate the optimal prevention strategy by studying the morbidity of RSV disease under the current recommendations for palivizumab prophylaxis in Israel. METHODS: We collected demographic and clinical data of all children hospitalized with microbiologically confirmed RSV bronchiolitis during 2015-2016 at Schneider Children's Medical Center. The seasonality of RSV disease was also studied for the period 2010-2017 in sentinel clinics scattered throughout Israel. RESULTS: Of the 426 hospitalized children, 106 (25%) had underlying diseases but were not eligible for palivizumab prophylaxis according to the current criteria in Israel. Their course was severe, with a mean hospital stay of 6.7 days and a 12% admission rate to the pediatric intensive care unit (PICU). Palivizumab-eligible children who did not receive the prophylaxis before hospitalization had the most severe course, with 22% admitted to the PICU. More children were diagnosed with RSV disease in October than in March among both hospitalized and ambulatory children; 44% of the palivizumab-eligible hospitalized children were admitted in the last 2 weeks of October, before 1 November which is the recommended date for starting palivizumab administration in Israel. CONCLUSIONS: According to the results of the present study we suggest advancing RSV prophylaxis in Israel from 1 November to mid-October. The precise palivizumab-eligible categories should be reconsidered.

Leukemoid reaction in the pediatric population: etiologies, outcome, and implications.

Leukemoid reaction (WBC > 30,000/µL) may indicate significant medical conditions, mostly infectious. Prompted by the lack of population-based data on the presentation, characteristics, and necessary workup in children with leukemoid reaction, we searched the database of a tertiary pediatric medical center for all children presented with at least one WBC count of ≥ 30,000/µL in 2009-2014. Demographic, clinical, and laboratory parameters were recorded. Children admitted with WBC < 30,000/µL served as controls. Pneumonia was the most common diagnosis in the leukemoid reaction group, with a 5.5-fold higher prevalence of pleuropneumonia than in the control group. The leukemoid group had a longer average hospital stay (7.5 vs. 5.5 days). Patients with WBC ≥ 50,000/µL had a sixfold higher rate of leukemia than patients with a lower count. There was a significant association of leukemia with low platelet count, low levels of C-reactive protein, and high levels of uric acid and lactate dehydrogenase. CONCLUSION: Children presented with a leukemoid reaction are at high risk of pneumonia, especially pleuropneumonia, and a long hospital stay. Those with WBC ≥ 50,000/µL have a sixfold higher risk of leukemia. For prompt diagnosis, clinicians should be aware of the variables associated with leukemia. What is Known: • Leukemoid reaction has been associated with infectious diseases. • Leukemoid reaction at presentation in adults is correlated with high morbidity and mortality. What is New: • Children with leukemoid reaction are at high risk of pleuropneumonia. • We did not observe increased mortality in children with a leukemoid reaction.

[ANTI-N-METHYL-D-ASPARTATE (NMDA) ENCEPHALITIS: THE ISRAELI PEDIATRIC MULTI-CENTER EXPERIENCE].

INTRODUCTION: Anti-N-methyl-D-aspartate (NMDA) encephalitis is a disorder characterized by acute neuro-psychiatric symptoms, appearing mostly after a recent febrile disease, with a gradual progressive course, associated with laboratory or radiologic evidence of active inflammation. Many of the patients will present with a continuous neuro-cognitive disorder which could lead to major morbidity and even mortality. It was recently reported that this disorder can present at childhood as a primary disease or as a secondary complication of herpes simplex infection. Early diagnosis and treatment have significantly improved the patients' prognosis and prevented chronic complications. We will present six pediatric patients at ages 1-14 years, followed from 2011-2014 in Schneider Children's Medical Center and Assaf Harofeh Medical Center due to acute encephalitis, with a clinical course under suspicion for anti-NMDA encephalitis. The article will review the clinical and diagnostic dilemmas and suggested guidelines. Pediatricians should be aware of this new emerging syndrome.

Extremely elevated C-reactive protein levels are associated with unfavourable outcomes, including death, in paediatric patients.

AIM: The aim of this study was to investigate the clinical significance of extremely elevated C-reactive protein (CRP) levels in hospitalised children. METHODS: We searched the electronic database of a tertiary paediatric medical centre for all patients admitted in 2010-2013 with a CRP of ≥ 30 mg/dL, and these comprised the study group. The controls were the other admissions. Data were collected on demographics, admission details, pre-existing conditions, discharge diagnosis, laboratory results and clinical outcomes. RESULTS: Our study group comprised 435 (0.72%) of the 59,997 patients hospitalised during the study period. The mortality rate and mean hospital stays were significantly higher in the study group, and infectious diseases were the most common diagnoses, affecting 389 patients (89.4%), particularly pneumonia (47.1%). Higher CRP was correlated with low albumin levels (p < 0.01). Bacteraemia was the most prevalent diagnosis (38%) in the 84 oncology patients, with a crude mortality rate of 17.6%. CONCLUSION: Infectious diseases, mainly bacterial, were the most common diagnoses in previously healthy children with CRP ≥ 30 mg/dL. Extremely elevated CRP levels were associated with an unfavourable clinical outcome, including high mortality, particularly in oncology patients. Paediatricians should be aware of the significance of extremely elevated CRP levels.

C-Reactive protein levels in children with primary herpetic gingivostomatitis.

BACKGROUND: C-reactive protein (CRP) is often used to distinguish bacterial from viral infections. However, the CRP level does have implications, which depend on the clinical scenario and are still under research. OBJECTIVES: To evaluate the distribution of CRP levels in children with primary herpetic gingivostomatitis. METHODS: The electronic database of a tertiary pediatric medical center was searched for all inpatients with a diagnosis of primary herpetic gingivostomatitis without bacterial coinfection. Background and clinical information was collected and CRP levels were analyzed. RESULTS: The study group consisted of 66 patients aged 8 months to 7.1 years who met the study criteria. The average CRP was 7.4 mg/dl (normal 0.5 mg/dl). More than a third of the patients had a level higher than 7 mg/dl. CONCLUSIONS: High values of CRP are prevalent in patients with primary herpetic gingivostomatitis, similar to adenoviral infections and some bacterial infections.

Medical And Surgical Management Of Orbital Cellulitis In Children.

OBJECTIVE: The purpose of this study was to identify features of orbital cellulitis that predict response to conservative treatment without surgical intervention and factors associated with a decision for surgery. PATIENTS AND METHODS: The medical files of patients diagnosed with orbital cellulitis at a tertiary medical center in central Israel between 1995 and 2010 were reviewed for clinical data, diagnosis, complications, and type of treatment. Comparison was made between patients treated with antibiotics and patients treated with antibiotics and surgery. RESULTS: Fifty-one patients (35 male) with a mean age of 6.1 years were identified. Main clinical signs included fever (mean 38.5°C), proptosis (82.3%), extraocular motility restriction (74.5%), and ocular pain (41.1%). Forty-one patients were successfully treated with antibiotics and 10 required endoscopic sinus surgery. On between-group comparison, the surgery group had severe eye pain (p = 0.009), severe proptosis (P = 0.02), longer intravenous antibiotic treatment (13.2 vs. 9.2 days, p = 0.04), and several imaging findings. Additional factors associated with surgical intervention included older children, subperiorbital abscess, larger dimension of the abscess (mean 15 mm), involvement of frontal sinuses and findings of intraorbital air bubbles. There was no visual deterioration in either group and no late sequelae. CONCLUSION: Factors associated with surgery included age older than 9 years, severe ocular pain, severe proptosis, and subperiorbital large abscess. These may be used for early identification of patients at risk of failure of only medical management.

Prevalence of Enterococcal Urinary Tract Infections With Positive Nitrites in Urinalysis in Pediatric Patients With High-Risk for Enterococcal Infections.

Enterococcus is a relatively uncommon pathogen that causes urinary tract infections (UTIs) in healthy children. Most enterococcal infections occur in patients with risk factors such as anatomical or functional urinary tract anomalies, also known as CAKUT (congenital anomalies of kidney and urinary tract). Children who are suspected of having UTIs and who have certain risk factors are often treated specifically for enterococcal infection as part of their empiric regimen. Our primary objective was to determine the prevalence of enterococcal UTIs among high-risk children, and specifically among those with positive nitrite tests, with the goal of avoiding treatment with specific anti-enterococcal agents. This retrospective study included all the episodes of UTI treated at a tertiary pediatric center during 2010 to 2018. The data collected from medical records included nephrological and urological risk factors, nitrite status, and isolated pathogens. Of 931 episodes of UTI, 467 (50%) were considered high-risk. In all, 24 of the latter had Enterococcus as a single pathogen; 23 (96%) of these occurred in patients with negative nitrites in the first urine dipstick taken. The sole patient with high-risk factors, a positive nitrite test and coexisting enterococcal UTI had a history of previous enterococcal UTIs. In pediatric patients with nephrological and urological risk factors, who have positive nitrites in urinalysis, the risk for enterococcal UTI appears substantially low. Therefore, in this context, specific anti-enterococcal empirical antibiotic therapy may be unnecessary.

Risk Factors for Invasive Interventions in Hospitalized Children With Suppurative Cervical Lymphadenitis.

Suppurative cervical lymphadenitis sometimes resolves with oral antibiotic treatment; however, many children are hospitalized for intravenous treatment due to lack of improvement. When there is no substantial improvement, the possibility of a liquefaction process is considered, and as a result, source control such as needle aspiration or open surgical drainage is recommended. We examined, among pediatric patients hospitalized with suppurative cervical lymphadenitis, clinical and laboratory predictors for invasive intervention that may lead to early imaging and intervention, hasten recovery, and shorten length of hospitalization. We compared laboratory and clinical characteristics of pediatric patients hospitalized with suppurative cervical lymphadenitis during 2010-2017, according to 3 treatments: needle aspiration (N = 54), open surgical drainage (N = 37), and conservative adequate antibiotic treatment only (N = 292). Physical indicators such as local erythema and fluctuation were found as predictors for invasive interventions in hospitalized pediatric patients diagnosed with suppurative cervical lymphadenitis. No significant associations were found between invasive interventions and laboratory parameters assessed in this study. Children who underwent interventions displayed a prolonged average length of hospitalization and received extended antibiotic treatment prior to hospital admission. In hospitalized pediatric patients diagnosed with suppurative cervical lymphadenitis, physical examination findings are the main predictive factors for invasive interventions. Consequently, when such straightforward clinical findings are observed in the context of insufficient improvement during antibiotic treatment, they should prompt consideration of invasive intervention.

Treatment of resistant bacterial infections in children: thinking inside and outside the box.

Antimicrobial resistance of bacteria causing pediatric infections has become more common and complicated in recent years. Although formerly confined to hospital settings, multi-drug resistant bacteria now also cause community-acquired infections. Treatment of infections caused by resistant pathogens is difficult, necessitating thinking both inside and outside the box. Determination of the precise minimal inhibitory concentration (MIC) is often crucial for selecting the most appropriate antibiotics, their doses, and use of prolonged infusions. For some multiply-resistant bacteria, off-label use of antibiotics, sometimes with no evidence from controlled studies ("salvage therapy") is unavoidable.

Hospitalization for respiratory syncytial virus bronchiolitis and disease severity in twins.

BACKGROUND: Respiratory syncytial virus (RSV) is a common cause of lower respiratory tract disease and hospitalization in infants and young children. Infants of multiple births, who are often premature, might be more susceptible to developing a more severe RSV infection than singletons. OBJECTIVE: To assess the impact of multiple births on the severity of RSV infection and define risk factors for acquiring RSV infection in infants of multiple birth. METHODS: Clinical data on infants hospitalized with RSV infection between 2008 and 2010 were retrospectively collected. RESULTS: Twins comprised 7.6% (66/875) of hospitalized infants with RSV bronchiolitis during the study period. Infants in the twin group were younger (122.4 +/- 131.7 vs. 204.5 +/- 278.8 days, P = 0.014), had a lower mean gestational age (35.3 +/- 2.6 vs. 38.6 +/- 2.5 weeks, P < 0.001), and were more likely to have been born prematurely compared with singleton infants (65.6% vs. 13%, P < 0.001). On a multivariable logistic regression analysis, young age, early gestational age and male gender were the only variables identified as risk factors for pediatric intensive care unit admission (P < 0.001, P < 0.001 and P = 0.03, respectively). In contrast, the mere fact of a child being a twin was not found to be a significant risk factor for disease severity. In addition, if one twin is hospitalized due to RSV infection, the other has a 34% chance of also being hospitalized with bronchiolitis. Young age was a significant risk factor for hospitalization of the second twin (P < 0.001) CONCLUSIONS: Our findings suggest that twins hospitalized with RSV bronchiolitis do not have an increased risk for severe infection as compared to singletons. However, a twin of an infant hospitalized with RSV infection has a considerable risk of also being hospitalized with bronchiolitis, thus close monitoring is recommended.