62 research outputs found
Single-and multiple viral respiratory infections in children: Disease and management cannot be related to a specific pathogen
Background: The number of viral pathogens associated with pediatric acute respiratory tract infection (ARI) has grown since the introduction of reverse transcription real-time polymerase chain reaction (RT-PCR) assays. Multiple viruses are detected during a single ARI episode in approximately a quarter of all cases. The clinical relevance of these multiple detections is unclear, as is the role of the individual virus. We therefore investigated the correlation between clinical data and RT-PCR results in children with single- and multiple viral ARI. Methods: Data from children with ARI were prospectively collected during two winter seasons. RT-PCR testing for 15 viruses was performed in 560 ARI episodes. In the patients with a single-viral etiology, clinical data, laboratory findings, patient management- and outcome data were compared between the different viruses. With this information, we compared data from children of whom RT-PCR data were negative, with children with single- and multiple viral positive results. Results: The viral detection rate was 457/560 (81.6%) of which 331/560 (59.1%) were single infections and 126/560 (22.5%) were multiple infections. In single viral infections, some statistically significant differences in demographics, clinical findings, disease severity and outcome were found between children with different viral etiologies. However, no clinically recognizable pattern was established to be virus-specific. In a multivariate analysis, the only variables that were correlated with longer hospital stay were the use of oxygen and nebulizer therapy, irrespective of the viral pathogen. Children with RT-PCR positive test results had a significant higher disease severity, fever, length of hospital stay, days of extra oxygen supply, and days of antibiotic treatment than children with a negative RT-PCR test result. For children with single- versus children with multiple positive RT-PCR test results, these differences were not significant. Conclusions: Disease (severity), management and outcome in pediatric ARI are not associated with a specific virus. Single- and multiple viral ARI do not significantly differ with regard to clinical outcome and patient management. For general pediatrics, RT-PCR assays should be restricted to pathogens for which therapy is available or otherwise may have clinical consequences. Further research with an extended panel of RT-PCR assays and a larger number of inclusions is necessary to further validate our findings
Bordetella pertussis: An underreported pathogen in pediatric respiratory infections, a prospective cohort study
Background: The incidence of pertussis has been increasing worldwide. In the Netherlands, the seroprevalence has risen higher than the reported cases, suggesting that laboratory tests for pertussis are considered infrequently and that even more pertussis cases are missed. The objective of our study was to determine the frequency of pertussis in clinically unsuspect cases compared to suspect cases with the intention of finding clinical predictors.Methods: The present prospective cohort study was part of a controlled clinical trial evaluating the impact of molecular diagnostics on clinical decision making in pediatric respiratory infections, performed during 2 winter seasons. For this study, in the first season pertussis was only tested in case of clinical suspicion, in the second season, pertussis was also tested without clinical suspicion. Multivariate and univariate analysis were performed using SPSS 18 and Statistical software 'R'.Results: In the two seasons respectively 22/209 (10,5%) and 49/373 (13,1%) cases were clinically suspected of pertussis. Bordetella pertussis was detected by real time RT-PCR in respectively 2/22 (9,1%) and 7/49 (14,3%) cases. In the second season an additional 7 cases of pertussis were found in clinically unsuspected cases (7/257 = 2,7%). These additional cases didn't differ in clinical presentation from children without a positive test for pertussis with respect to respiratory symptoms.Conclusions: Pertussis in children sometimes mimics viral respiratory tract infections. If pertussis diagnostics are based on clinical suspicion alone, about 1 in 5 cases (19%) is missed. Despite widely accepted clinical criteria, paroxysmal cough is not a good predictor of pertussis. To prevent spreading, physicians should include B. pertussis in ro
Treatment with highly active antiretroviral therapy in human immunodeficiency virus type 1-infected children is associated with a sustained effect on growth
INTRODUCTION: Growth failure is a common feature of children with human
immunodeficiency virus type 1 (HIV-1) infection. Children who are treated
with mono or dual nucleoside analogue reverse transcriptase inhibitor
(NRTI) therapy show a temporary increase in weight gain and linear growth
rate. In adults, protease-inhibitor-containing antiretroviral therapy is
associated with a sustained weight gain and increased body mass index
(BMI). Experience with protease inhibitors and growth in children is still
limited. The data mainly deal with short-term effects on growth.
OBJECTIVE: To evaluate the effect of highly active antiretroviral therapy
(HAART) on growth in children with HIV-1 infection. DESIGN AND METHODS: We
analyzed selected growth parameters, clinical data, and laboratory results
as part of a prospective, open, uncontrolled, multicenter study to
evaluate the clinical, immunologic, and virologic response to HAART
consisting of indinavir, zidovudine, and lamivudine in children with HIV-1
infection. Height and weight were measured at 0, 12, 24, 36, 48, 60, 72,
84, and 96 weeks after initiation of HAART. Information about the
children's growth before enrollment in the study was retrieved from the
hospital medical records and/or the school doctor or health center. BMI
was calculated. z Scores were used to express the standard deviation (SD)
in SD units from the Dutch reference curves for age and gender. Viral
loads and CD4+ T-cell counts were examined prospectively and related to
these growth parameters. z Scores were also calculated for CD4+ T-cell
counts to correct for age-related differences. A z score of 0 represents
the P50, which is exactly the age/sex-appropriate median. A height z score
of -1 indicates that a child's height is 1 SD below the age- and
gender-specific median height for the normal population. Virologic
responders were defined as those who either reached an undetectable viral
load (1.5 log reduction in viral load compared
with baseline at week 12 after the initiation of HAART, which was
maintained during the follow-up period. RESULTS. PATIENTS: Twenty-four
patients were included (age: 0.4-16.3 years at baseline), with a median
HIV-1 RNA load of 105 925 copies/mL (5.03 log), a median CD4+ T-cell count
of 0.586 x 10(9)/L (median z score: -2.28 SD), a median height z score of
-1.22, a median weight z score of -0.74, and a median baseline BMI z score
of -0.32. Eleven patients were naive to antiretroviral therapy, and 13
patients had received previous treatment with NRTI monotherapy. Twenty
children used indinavir and 4 children used nelfinavir as part of HAART.
VIROLOGIC AND IMMUNOLOGIC RESPONSES TO HAART: Seventeen children were
virologic responders, and 7 children were virologic nonresponders. In
patients naive to NRTIs, median baseline viral loads were significantly
higher than in pretreated patients. However, at weeks 48 and 96, there was
no significant difference between the viral loads of both groups. At
baseline, there was no significant difference in CD4+a T-cell z scores
between virologic responders and nonresponders or between naive and
pretreated patients. During 96 weeks of HAART, the increase of CD4+ T-cell
z score was significantly higher in responders than in nonresponders. The
increase in CD4+ T-cell z score was not significantly different for naive
and pretreated patients. HEIGHT, WEIGHT, AND BMI z SCORE CHANGES: We found
that
The role of ARNT in liver and myeloid cell function
Aryl hydrocarbon receptor nuclear translocator (ARNT) is a transcription factor which acts as a general partner for members of the bHLH/PAS family of transcription factors. To investigate the effect of long term ARNT deletion in hepatocyte and myeloid cells, we created 2 lines of mice with ARNT deletion in these cells. Mice lacking hepatocyte ARNT had impaired glucose tolerance, increased gluconeogenesis, decreased ATP and increased post-prandial serum triglycerides. However, in contrast to type 2 diabetes (T2D) hepatic ARNT deletion resulted in decreased liver steatosis. Importantly, these changes became non-significant after high fat diet (HFD). Decreased ARNT in myeloid cells led to decreased cytokine expression, decreased phagocytosis, decreased bactericidal activity, impaired response to infection, and impaired wound healing. Again, the phenotype of impaired wound healing equilibrated in a diabetic milieu. In addition mice lacking ARNT in myeloid cells displayed impaired glucose tolerance on HFD and paradoxically increased liver inflammation. In human monocytes ARNT mRNA correlated negatively with serum cytokine levels of IL-6, IL-8, MCP-1 and TNF-α. This data demonstrates that ARNT has important roles in hepatocyte and myeloid cell function and suggests that modulation of this transcription factor could be used in future therapy for diabetes and disorders of immune function
ADVANCE AUSTRALIA FAIR? (IN)EQUALITY, PROSPERITY AND SUSTAINABILITY IN SHAPING AUSTRALIA’S FUTURE
Scholarships & Prizes Office. University of Sydne
Persistent sterile leukocyturia is associated with impaired renal function in human immunodeficiency virus type 1-infected children treated with indinavir
BACKGROUND: Prolonged administration of indinavir is associated with the
occurrence of a variety of renal complications in adults. These
well-documented side effects have restricted the use of this potent
protease inhibitor in children. DESIGN: A prospective study to monitor
indinavir-related nephrotoxicity in a cohort of 30 human immunodeficiency
virus type 1-infected children treated with indinavir. METHODS: Urinary
pH, albumin, creatinine, the presence of erythrocytes, leukocytes,
bacteria and crystals, and culture were analyzed every 3 months for 96
weeks. Serum creatinine levels were routinely determined at the same time
points. Steady-
Persistence of clones of coagulase-negative staphylococci among premature neonates in neonatal intensive care units: two-center study of bacterial genotyping and patient risk factors
From 1 January 1995 until 1 January 1996, we studied the molecular
epidemiology of blood isolates of coagulase-negative staphylococci (CoNS)
in the Neonatal Intensive Care Units (NICUs) of the Sophia Children's
Hospital (SCH; Rotterdam, The Netherlands) and the Wilhelmina Children's
Hospital (WCH; Utrecht, The Netherlands). The main goal of the present
study was to detect putatively endemic clones of CoNS persisting in these
NICUs. Pulsed-field gel electrophoresis was used to detect the possible
presence of endemic clones of clinical significance. In addition, clinical
data of patients in the SCH were analyzed retrospectively to identify risk
factors for the acquisition of positive blood cultures. In both centers,
endemic CoNS clones were persistently present. Thirty-three percent of the
bacterial isolates derived from blood cultures in the SCH belonged to a
single genotype. In the WCH, 45% of all bacterial strains belonged to a
single clone. These clones were clearly different from each other, which
implies that site specificity is involved. Interestingly, we observe that
the clonal type in the SCH differed significantly from the incidentally
occurring strains with respect to both the average pH and partial CO2
pressure of the patient's blood at the time of bacterial culture. We found
that the use of intravascular catheters, low gestational age, and a long
hospital stay were important risk factors for the development of a
putative CoNS infection. When the antibiotic susceptibility of the
bacterial isolates was assessed, a clear correlation between the nature of
the antibiotics most frequently used as a first line of defense versus the
resistance profile was observed. We conclude that the intensive use of
antibiotics in an NICU setting with highly susceptible patients causes
selection of multiresistant clones of CoNS which subsequently become
endemic
Oral antibiotics for neonatal infections: a systematic review and meta-analysis
Background: Worldwide many neonates suffer from bacterial infections. Adequate treatment is important but
is associated with prolonged hospitalization for intravenous administration. In older children, oral switch therapy
has been proven effective and safe for several indications and is now standard care.
Objectives: To evaluate the currently available evidence on pharmacokinetics, safety and efficacy of oral antibiotics and oral switch therapy in neonates (0–28 days old).
Methods: We performed systematic searches in Medline, Embase.com, Cochrane, Google Scholar and Web of
Science. Studies were eligible if they described the use of oral antibiotics in neonates (0–28 days old), including
antibiotic switch studies and pharmacological studies.
Results: Thirty-one studies met the inclusion criteria. Compared with parenteral administration, oral antibiotics
generally reach their maximum concentration later and have a lower bioavailability, but in the majority of cases
adequate serum levels for bacterial killing are reached. Furthermore, studies on efficacy of oral antibiotics
showed equal relapse rates (
RAIN study: A protocol for a randomised controlled trial evaluating efficacy, safety and cost-effectiveness of intravenous-to-oral antibiotic switch therapy in neonates with a probable bacterial infection
__Introduction__ High morbidity and mortality rates of proven bacterial infection are the main reason for substantial use of intravenous antibiotics in neonates during the first week of life. In older children, intravenous-to-oral switch after 48 hours of intravenous therapy has been shown to have many advantages and is nowadays commonly practised. We, therefore, aim to evaluate the effectiveness, safety and cost-effectiveness of an early intravenous-to-oral switch in neonates with a probable bacterial infection.
__Methods and analysis__ We present a protocol for a multicentre randomised controlled trial assessing the non-inferiority of an early intravenous-to-oral antibiotic switch compared with a full course of intravenous antibiotics in neonates (0-28 days of age) with a probable bacterial infection. Five hundred and fifty patients will be recruited in 17 hospitals in the Netherlands. After 48 hours of intravenous treatment, they will be assigned to either continue with intravenous therapy for another 5 days (control) or switch to amoxicillin/clavulanic acid suspension (intervention). Both groups will be treated for a total of 7 days. The primary outcome will be bacterial (re)infection within 28 days after treatment completion. Secondary outcomes are the pharmacokinetic profile of oral amoxicillin/clavulanic acid, the impact on quality of life, cost-effectiveness, impact on microbiome development and additional yield of molecular techniques in diagnosis of probable bacterial infection.
__Ethics and dissemination__ This study has been approved by the Medical Ethics Committee of the Erasmus Medical Centre. Results will be presented in peer-reviewed journals and at international conferences
Carriage of Mycoplasma pneumoniae in the Upper Respiratory Tract of Symptomatic and Asymptomatic Children: An Observational Study
Background:Mycoplasma pneumoniae is thought to be a common cause of respiratory tract infections (RTIs) in children. The diagnosis of M. pneumoniae RTIs currently relies on serological methods and/or the detection of bacterial DNA in the upper respiratory tract (URT). It is conceivable, however, that these diagnostic methods also yield positive results if M. pneumoniae is carried asymptomatically in the URT. Positive results from these tests may therefore not always be indicative of a symptomatic infection. The existence of asymptomatic carriage of M. pneumoniae has not been established. We hypothesized that asymptomatic carriage in children exists and investigated whether colonization and symptomatic infection could be differentiated by current diagnostic methods.Methods and Findings:This study was conducted at the Erasmus MC-Sophia Children's Hospital and the after-hours General Practitioners Cooperative in Rotterdam, The Netherlands. Asymptomatic children (n = 405) and children with RTI symptoms (n = 321) aged 3 mo to 16 y were enrolled in a cross-sectional study from July 1, 2008, to November 30, 2011. Clinical data, pharyngeal and nasopharyngeal specimens, and serum samples were collected. The primary objective was to differentiate between colonization and symptomatic infection with M. pneumoniae by current diagnostic methods, especially real-time PCR. M. pneumoniae DNA was detected in 21.2% (95% CI 17.2%-25.2%) of the asymptomatic children and in 16.2% (95% CI 12.2%-20.2%) of the symptomatic children (p = 0.11). Neither serology nor quantitative PCR nor culture differentiated asymptomatic carriage from infection. A total of 202 children were tested for the presence of other bacterial and viral pathogens. Two or more pathogens were found in 56% (63/112) of the asymptomatic children and in 55.5% (50/90) of the symptomatic children. Finally, longitudinal sampling showed persistence of M. pneumoniae in the URT for up to 4 mo. Fifteen of the 21 asymptomatic children with M. pneumoniae and 19 of the 22 symptomatic children with M. pneumoniae in this longitudinal follow-up tested negative after 1 mo.Conclusions:Although our study has limitations, such as a single study sit
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