Clinician Preferences for Oseltamivir Use in Children With Influenza in the Outpatient Setting.

Objective: Professional societies recommend antiviral treatment of all children at high risk for severe or complicated influenza disease, regardless of symptom duration. However, outpatient antiviral prescribing practices are inconsistent. We aimed to assess pediatric clinicians' outpatient prescribing practices for oseltamivir in children with influenza.

Respiratory and Other Infections Following COVID.

Background: One hypothesis for the respiratory syncytial virus (RSV) surge in 2022 was suppression of immune responses following SARS-CoV-2 infection. Our objective was to compare the risk of subsequent RSV and other infections among children with and without SARS-CoV-2 infection.

Methods: We conducted a retrospective cohort study using electronic health record data from 27 US health systems analyzing children aged under 5 years with SARS-CoV-2 infection (test/coded) between March and July 2022.

Data science for pediatric infectious disease: utilizing COVID-19 as a model.

Purpose Of Review: During the COVID-19 pandemic, governments and public health agencies used data science tools and data sources in real time to evaluate pathogen transmissibility, disease burden, healthcare capacity, and evaluate treatment and preventive measures. The purpose of the review is to highlight the application of these data sources and methods during the COVID-19 response.

Recent Findings: Advances in the development of common data models enabled multisite data networks to overcome healthcare data fragmentation, enabling national surveillance platforms, and offering unprecedented statistical power to conduct national surveillance and detect emerging clinical entities like MIS-C and long COVID in diverse pediatric populations.

Influenza-Associated Acute Necrotizing Encephalopathy in US Children.

Importance: Acute necrotizing encephalopathy (ANE) is a rare, but severe, neurologic condition for which epidemiologic and management data remain limited. During the 2024-2025 US influenza season, clinicians at large pediatric centers anecdotally reported an increased number of children with influenza-associated ANE, prompting this national investigation.

Objective: To understand the clinical presentation, interventions, and outcomes among US children diagnosed with influenza-associated ANE.

Variability of Clinician Recommendations for Oseltamivir in Children Hospitalized With Influenza.

Background And Objectives: Although national recommendations advise antivirals for all hospitalized children with influenza, this recommendation is not supported by high-quality evidence like a randomized clinical trial, and recent data suggest nonadherence to guidelines. Our objective was to describe clinician treatment preferences for oseltamivir in hospitalized children.

Methods: This cross-sectional survey of pediatricians from 5 specialties was conducted at 7 US children's hospitals from March to June 2024.

Pediatric Long COVID Subphenotypes: An EHR-based study from the RECOVER program.

Pediatric Long COVID has been associated with a wide variety of symptoms, conditions, and organ systems, but distinct clinical presentations, or subphenotypes, are still being elucidated. In this exploratory analysis, we identified a cohort of pediatric (age <21) patients with evidence of Long COVID and no pre-existing complex chronic conditions using electronic health record data from 38 institutions and used an unsupervised machine learning-based approach to identify subphenotypes. Our method, an extension of the Phe2Vec algorithm, uses tens of thousands of clinical concepts from multiple domains to represent patients' clinical histories to then identify groups of patients with similar presentations.

Influenza-associated hospitalization rates by underlying conditions, 2016-17 to 2019-20: A retrospective cohort study.

Background: Various underlying medical conditions (UMCs) elevate the risk of influenza-associated hospitalization. We evaluated how these rates changed by type and number of UMCs.

Methods: Retrospective cohorts were constructed among adult members of two health systems aged ≥18 years with prior healthcare utilization.

Evaluation of an Influenza Vaccination Program in the Pediatric Emergency Department.

Objective: To evaluate influenza vaccine administration rate among eligible patients in pediatric emergency departments (EDs) following the introduction of a standardized vaccination program.

Study Design: We conducted a retrospective study of children ≥6 months of age evaluated in a tertiary care pediatric ED and 3 affiliated ED sites. Our preintervention period was September 2019 through April 2020, and intervention period was September 2020 through April 2023.

Opportunities and Challenges in Using Electronic Health Record Systems to Study Postacute Sequelae of SARS-CoV-2 Infection: Insights From the NIH RECOVER Initiative.

The benefits and challenges of electronic health records (EHRs) as data sources for clinical and epidemiologic research have been well described. However, several factors are important to consider when using EHR data to study novel, emerging, and multifaceted conditions such as postacute sequelae of SARS-CoV-2 infection or long COVID. In this article, we present opportunities and challenges of using EHR data to improve our understanding of long COVID, based on lessons learned from the National Institutes of Health (NIH)-funded RECOVER (REsearching COVID to Enhance Recovery) Initiative, and suggest steps to maximize the usefulness of EHR data when performing long COVID research.

Ongoing Symptoms After Acute SARS-CoV-2 or Influenza Infection in a Case-Ascertained Household Transmission Study: 7 US Sites, 2021-2023.

Background: The prevalence and risk factors for ongoing symptoms following severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) [SCV2]) or influenza infection are not well characterized. We conducted a prospective cohort study of households wherein ≥1 individual was infected with SCV2 or influenza to evaluate prevalence of and factors associated with ongoing symptoms at 90 days.

Methods: Index cases and their household contacts provided baseline health and sociodemographic information and collected daily respiratory specimens for 10 days following enrollment.

Estimating the generation time for influenza transmission using household data in the United States.

The generation time, representing the interval between infections in primary and secondary cases, is essential for understanding and predicting the transmission dynamics of seasonal influenza, including the real-time effective reproduction number (Rt). However, comprehensive generation time estimates for seasonal influenza, especially since the 2009 influenza pandemic, are lacking. We estimated the generation time utilizing data from a 7-site case-ascertained household study in the United States over two influenza seasons, 2021/2022 and 2022/2023.

Ethnic and racial differences in children and young people with respiratory and neurological post-acute sequelae of SARS-CoV-2: an electronic health record-based cohort study from the RECOVER Initiative.

Background: Children from racial and ethnic minority groups are at greater risk for severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection, but it is unclear whether they have increased risk for post-acute sequelae of SARS-CoV-2 (PASC). Our objectives were to assess whether the risk of respiratory and neurologic PASC differs by race/ethnicity and social drivers of health.

Methods: We conducted a retrospective cohort study of individuals <21 years seeking care at 24 health systems across the U.

Racial/ethnic differences in post-acute sequelae of SARS-CoV-2 in children and adolescents in the United States.

Racial/ethnic differences are associated with the symptoms and conditions of post-acute sequelae SARS-CoV-2 infection (PASC) in adults. These differences may exist among children and warrant further exploration. We conducted a retrospective cohort study with difference-in-differences analyzes to assess these differences in children and adolescents under the age of 21.

Real-world effectiveness and causal mediation study of BNT162b2 on long COVID risks in children and adolescents.

Background: The impact of pre-infection vaccination on the risk of long COVID remains unclear in the pediatric population. We aim to assess the effectiveness of BNT162b2 on long COVID risks with various strains of the SARS-CoV-2 virus in children and adolescents, using comparative effectiveness methods. We further explore if such pre-infection vaccination can mitigate the risk of long COVID beyond its established protective benefits against SARS-CoV-2 infection using causal mediation analysis.

Influenza vaccine effectiveness against hospitalizations and emergency department or urgent care encounters for children, adolescents, and adults during the 2023-2024 season, United States.

Background: The 2023-2024 influenza season had predominant influenza A(H1N1)pdm09 virus activity, but A(H3N2) and B viruses co-circulated. Seasonal influenza vaccine strains were well-matched to these viruses.

Methods: Using health care encounters data from health systems in 8 states, we evaluated influenza vaccine effectiveness (VE) against influenza-associated medical encounters from October 2023-April 2024.

Underutilization of Influenza Antiviral Treatment Among Children and Adolescents at Higher Risk for Influenza-Associated Complications - United States, 2023-2024.

Annually, tens of thousands of U.S. children and adolescents are hospitalized with seasonal influenza virus infection.

Respiratory syncytial virus (RSV) vaccine effectiveness against RSV-associated hospitalisations and emergency department encounters among adults aged 60 years and older in the USA, October, 2023, to March, 2024: a test-negative design analysis.

Background: Respiratory syncytial virus vaccines first recommended for use during 2023 were efficacious against lower respiratory tract disease in clinical trials. Limited real-world data regarding respiratory syncytial virus vaccine effectiveness are available. To inform vaccine policy and address gaps in evidence from the clinical trials, we aimed to assess the effectiveness against respiratory syncytial virus-associated hospitalisations and emergency department encounters among adults aged at least 60 years.

Pediatric Long COVID Subphenotypes: An EHR-based study from the RECOVER program.

Pediatric Long COVID has been associated with a wide variety of symptoms, conditions, and organ systems, but distinct clinical presentations, or subphenotypes, are still being elucidated. In this exploratory analysis, we identified a cohort of pediatric (age <21) patients with evidence of Long COVID and no pre-existing complex chronic conditions using electronic health record data from 38 institutions and used an unsupervised machine learning-based approach to identify subphenotypes. Our method, an extension of the Phe2Vec algorithm, uses tens of thousands of clinical concepts from multiple domains to represent patients' clinical histories to then identify groups of patients with similar presentations.

Estimating the generation time for influenza transmission using household data in the United States.

The generation time, representing the interval between infections in primary and secondary cases, is essential for understanding and predicting the transmission dynamics of seasonal influenza, including the real-time effective reproduction number (Rt). However, comprehensive generation time estimates for seasonal influenza, especially post the 2009 influenza pandemic, are lacking. We estimated the generation time utilizing data from a 7-site case-ascertained household study in the United States over two influenza seasons, 2021/2022 and 2022/2023.

Reduced risk of SARS-CoV-2 infection among household contacts with recent vaccination and past COVID-19 infection: results from 2 multisite case-ascertained household transmission studies.

Households are a primary setting for the transmission of SARS-CoV-2. We examined the role of prior SARS-CoV-2 immunity on the risk of infection in household close contacts. Households in the United States with an individual who tested positive for SARS-CoV-2 from September 2021 to May 2023 were enrolled if the index case's illness began ≤ 6 days prior.

Antibiotic use and class absenteeism in children with influenza-like-illness in an emergency department.

Background: Children with influenza-like-illness (ILI) often require clinician clearance or antibiotics to return to child care or school. Study objectives were to examine the association between antibiotic receipt during an Emergency Department (ED) visit for ILI and the outcomes of class absenteeism and illness duration.

Methods: A secondary analysis of 251 children aged 2 months to 12 years with uncomplicated ILI discharged from the ED from December 1, 2018 to November 30, 2019 was conducted.

Pediatric Nirmatrelvir/Ritonavir Prescribing Patterns During the COVID-19 Pandemic.

Objectives: This study seeks to identify demographic and clinical factors prompting clinician prescribing of nirmatrelvir/ritonavir to pediatric patients for management of coronavirus disease 2019 (COVID-19) infection.

Methods: Patients aged 12 to 17 years with a COVID-19 infection and nirmatrelvir/ritonavir prescription during an outpatient clinical encounter within a PEDSnet-affiliated institution between January 2022 and August 2023 were identified using electronic health record data. A multivariate logistic regression analysis was used to estimate odds of nirmatrelvir/ritonavir prescription after adjusting for various factors.