Publications by authors named "McMullan B"

Article Synopsis
  • A study reviewed medical records from eight hospitals in Australia and New Zealand examining how intravenous aciclovir is prescribed for suspected herpes simplex virus (HSV) disease in neonates and older children between January and December 2019.
  • Out of 1,426 patients, most received aciclovir for suspected cases without definitive HSV testing; notably, only a small fraction had confirmed diagnoses among older children, indicating potentially excessive and unjustified prescribing.
  • Among the patients, adverse effects included instances of nephrotoxicity and extravasation injuries, raising concerns about the safety and necessity of such treatments in the pediatric population.
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Background: Prompt antibiotic administration for febrile neutropenia (FN) is standard of care, and targets of time to antibiotics (TTA) <60 min are common. We sought to determine the effect of TTA ≥60 versus <60 min on adverse outcomes (intensive care unit (ICU) admission or death) in children with cancer and FN. Effect modification by a decision rule that predicts infection (AUS-rule) and bacteraemia were also investigated.

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Introduction: Staphylococcus aureus bacteraemia (SAB) is the most common cause of sepsis, contributing to paediatric intensive care unit admission in Australia and New Zealand. While deep venous thrombosis (DVT) has been reported in children with invasive S. aureus infections, the actual frequency and possible effects of thrombosis on disease severity and outcome in paediatric SAB remain unknown.

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Background: International consensus definitions for invasive aspergillosis (IA) in research are rigorous, yet clinically significant cases are often excluded from clinical studies for not meeting proven/probable IA case definitions. To better understand reasons for the failure to meet criteria for proven/probable infection, we herein review 47 such cases for their clinical and microbiological characteristics and outcomes.

Methods: Data on 47 cases that did not meet consensus IA definitions but were deemed significant were derived from a retrospective, observational, multicenter survey of 382 presumed IA cases across Australasia, of which findings of 221 proven/probable infections were recently published.

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  • Respiratory syncytial virus (RSV) is a major cause of serious respiratory infections in children, and this study aimed to compare hospitalized cases of RSV with other viral infections in children under 2 years old.
  • A retrospective analysis of 660 children revealed that those with RSV were older and showed more severe symptoms, needing longer hospital stays and more frequent antibiotic treatment.
  • The findings highlight that RSV-positive cases exhibited more serious clinical features, indicating a need for better prevention and treatment strategies for RSV infections in young children.
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  • Rising rates of antimicrobial resistance (AMR) were noted in Staphylococcus aureus and Enterococcus spp. in Australia, with a significant number of blood stream infections (BSIs) occurring in children.
  • The Australian Group on Antimicrobial Resistance (AGAR) analyzed 2,091 S. aureus and 534 enterococcal BSIs over nine years, revealing key trends in community vs. hospital onset infections and varying resistance levels.
  • A shift in resistance profiles was observed, especially in Enterococcus faecium, prompting the need for detailed and age-stratified reporting of AMR data.
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Background: Gram-negative bloodstream infections are associated with significant morbidity and mortality in children. Increasing antimicrobial resistance (AMR) is reported globally, yet efforts to track pediatric AMR at a national level over time are lacking.

Methods: The Australian Group on Antimicrobial Resistance (AGAR) surveillance program captures clinical and microbiological data of isolates detected in blood cultures across Australia.

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Penicillin allergy is a significant burden on patient, prescribing and hospital outcomes. There has been increasing interest in the incorporation of penicillin allergy testing (i.e.

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  • The study analyzed invasive pneumococcal disease (IPD) cases in children at five pediatric hospitals in Australia over 5.5 years, highlighting the impact of pneumococcal conjugate vaccines (PCV) on IPD epidemiology.
  • Out of 377 IPD episodes in 375 children, 90% had received at least three doses of PCV, with the majority experiencing complicated pneumonia; however, the findings also noted a concerning rate of serious infections caused by non-vaccine serotypes (NVTs).
  • The research prompts the need for changes in treatment protocols, as 17% of NVTs showed resistance to ceftriaxone, suggesting that vancomycin should be included in the
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Background: Following reduction of public health and social measures concurrent with SARS-CoV-2 Omicron emergence in late 2021 in Australia, COVID-19 case notification rates rose rapidly. As rates of direct viral testing and reporting dropped, true infection rates were most likely to be underestimated.

Objective: To better understand infection rates and immunity in this population, we aimed to estimate SARS-CoV-2 seroprevalence in Australians aged 0-19 years.

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  • Pediatric long COVID is still not fully understood, and this study aimed to explore its impact on children and adolescents following the 2021 Delta variant outbreak in Australia.
  • Out of 11,864 surveyed parents, 17.6% responded, with 11.7% of children reporting ongoing symptoms or functional impairment; only a small fraction were classified as having Long COVID.
  • The findings suggest that while most children recover within 12 weeks, a notable minority may experience long-term symptoms, highlighting the need for further attention and research on risk factors like age and previous health issues.
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From 1 January 2020 to 31 December 2021, thirty-eight institutions across Australia submitted data to the Australian Group on Antimicrobial Resistance (AGAR) from patients aged < 18 years (AGAR-Kids). Over the two years, 1,679 isolates were reported from 1,611 patients. This AGAR-Kids report aims to describe the population of children and adolescents with bacteraemia reported to AGAR and the proportion of resistant isolates.

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  • There is a significant need for clinical trials that include infants, children, and adolescents to ensure evidence-based care; this communication discusses three different trial design strategies to address this issue.
  • The three strategies include sequential, parallel, and unified adult-pediatric Bayesian adaptive designs, which allow for better integration of pediatric populations into clinical research.
  • The unified design, exemplified by the SNAP trial, utilizes Bayesian hierarchical models to share data across age groups, enhancing accuracy in assessing treatment safety and efficacy for both children and adults.
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Introduction: Monitoring healthcare quality is challenging in paediatric critical care due to measure variability, data collection burden, and uncertainty regarding consumer and clinician priorities.

Objective: We sought to establish a core quality measure set that (i) is meaningful to consumers and clinicians and (ii) promotes alignment of measure use and collection across paediatric critical care.

Design: We conducted a multi-stakeholder Delphi study with embedded consumer prioritisation survey.

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Toxic shock syndrome (TSS) is a life-threatening complication of infection typically caused by one of two bacterial species: and The outcomes in children with TSS can be devastating. Careful consideration of TSS is required as a potential differential diagnosis of children presenting with sepsis or severe illness associated with fever and rash.

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This systematic review evaluates the current global impact of invasive infections caused by Pneumocystis jirovecii (principally pneumonia: PJP), and was carried out to inform the World Health Organization Fungal Priority Pathogens List. PubMed and Web of Science were used to find studies reporting mortality, inpatient care, complications/sequelae, antifungal susceptibility/resistance, preventability, annual incidence, global distribution, and emergence in the past 10 years, published from January 2011 to February 2021. Reported mortality is highly variable, depending on the patient population: In studies of persons with HIV, mortality was reported at 5%-30%, while in studies of persons without HIV, mortality ranged from 4% to 76%.

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Article Synopsis
  • The World Health Organization initiated a fungal pathogen priority list due to the rising threat of fungal diseases, focusing on the epidemiology of Talaromyces marneffei, Coccidioides species, and Paracoccidioides species.
  • A total of 48 studies were reviewed, revealing high mortality rates for invasive infections (up to 22.7%) and frequent hospitalizations for coccidioidomycosis (up to 84%), often with readmission.
  • There is evidence of reduced effectiveness of certain antifungals against some species, with risk factors for mortality related to CD4 counts, and outbreaks commonly linked to construction activities; increased surveillance and further studies are needed.
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The World Health Organization, in response to the growing burden of fungal disease, established a process to develop a fungal priority pathogens list. This systematic review aimed to evaluate the epidemiology and impact of eumycetoma. PubMed and Web of Science were searched to identify studies published between 1 January 2011 and 19 February 2021.

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  • A 3-year study in five Australian children's hospitals found that Gram-negative bloodstream infections (GNBSIs) significantly affect children under 5, often occurring in those with existing health issues and central venous catheters.
  • Out of 931 infection episodes involving 818 children, community onset was common, and 71% of cases involved antibiotic-resistant pathogens, particularly from the Enterobacterales family.
  • The study highlighted a 3% in-hospital mortality rate, with infections involving third-generation cephalosporin resistant Enterobacterales linked to higher mortality rates, suggesting a need for improved prevention and treatment strategies.
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  • - Invasive fungal disease (IFD) is less common in children with solid tumors (1.9% overall prevalence) than in those with blood cancers; most IFD cases are not clearly defined in risk groups.
  • - A study of over 2,000 children showed that 42.5% of IFD cases occurred in patients with neuroblastoma, which had the highest prevalence at 7.0%.
  • - Candida species were the main pathogens, accounting for 54.8% of proven/probable IFD cases, suggesting that routine prevention measures might not be necessary for children with solid tumors.
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Background: Respiratory syncytial virus (RSV) is the leading cause of acute lower respiratory infections (ALRIs) in children <2 years of age. Currently, there are limited data on risk factors for very severe RSV-ALRI requiring intensive care unit (ICU) admission.

Methods: We conducted a case-control study of children <2 years old admitted with RSV-ALRI to the Sydney Children's Hospital Network, comprising 2 large tertiary pediatric hospitals.

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Cryptococcosis is a major worldwide disseminated invasive fungal infection. Cryptococcosis, particularly in its most lethal manifestation of cryptococcal meningitis, accounts for substantial mortality and morbidity. The breadth of the clinical cryptococcosis syndromes, the different patient types at-risk and affected, and the vastly disparate resource settings where clinicians practice pose a complex array of challenges.

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