#Influenza and Other Respiratory Viruses Research #References (AMEDEO, August 22 '26)

 

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A randomised, open-label clinical study on the efficacy of #baloxavir marboxil and #oseltamivir for post-exposure #prevention of #influenza in a #hospital setting: a study protocol

 

Abstract

Introduction 

Healthcare settings are high-risk environments for the transmission of respiratory viruses. Effective strategies to prevent hospital-acquired influenza, particularly post-exposure prophylaxis for close contacts (CCs), are urgently needed. This study aims to assess the effectiveness of baloxavir marboxil (baloxavir) and oseltamivir in preventing influenza virus infection among CCs who have been exposed to confirmed influenza cases and are unable to be immediately isolated in the hospital ward.

Methods and analysis 

This multicentre, randomised, open-label, parallel-controlled trial involves hospitalised patients with laboratory-confirmed influenza (index patients) and their CCs. CCs will be randomised into three groups: baloxavir marboxil, oseltamivir or placebo. Baloxavir (40 mg or 80 mg for ≥80 kg) will be administered as a single dose on day 1, while oseltamivir (75 mg) will be given once a day for 5 days. CCs will be monitored for influenza-like symptoms, with respiratory samples collected for rapid antigen test or reverse-transcription PCR testing at baseline, day 5±1 and day 10±1 or earlier if symptoms develop. The primary outcome is the 5-day incidence of clinical influenza, defined as laboratory-confirmed infection with concurrent fever and at least one respiratory symptom. Secondary outcomes will include the 5-day incidence of laboratory-confirmed influenza, the 10-day incidence of clinical influenza and the percentage of CCs infected with resistance-associated treatment-emergent influenza variants.

Ethics and dissemination 

The study has been approved by the Clinical Research Ethics Committee of China-Japan Friendship Hospital (2024-KY-401). The results of the study will be submitted for publication in a peer-reviewed journal with online accessibility. The full protocol, de-identified participant data and statistical code will be openly available in a public repository within 12 months after trial completion.

Trial registration number NCT06762587. 

https://creativecommons.org/licenses/by-nc/4.0/

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: https://creativecommons.org/licenses/by-nc/4.0/.

Source: 

Link: https://bmjopen.bmj.com/content/16/8/e118748

____

#Influenza and Other Respiratory Viruses Research #References (AMEDEO, August 16 '26)-

 

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52. PAUL KK, Newall AT
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The association of empirical #treatment with #oseltamivir with the #outcome of critically ill patients admitted with severe acute respiratory illness (#SARI)

 

Abstract

Objective

Neuraminidase inhibitors (NAIs) are widely used empirically in critically ill patients with suspected influenza; however, their effect on mortality remains uncertain. This multicenter study evaluates the association between empirical treatment with oseltamivir and the outcome of critically ill patients with Severe Acute Respiratory Infection (SARI) admitted to the Intensive Care Unit (ICU).

Methods

This was a retrospective cohort study conducted in the ICUs of four hospitals in Saudi Arabia, involving adult patients with SARI from September 2012 to December 2018. Data collected were: demographics, comorbidities, clinical presentation, and outcomes among patients treated with oseltamivir and those who were not. The primary outcome was 90-day mortality. The association of oseltamivir and mortality was evaluated adjusting for propensity score.

Results

During the study period, 456 patients with SARI were included in the study, 301 were treated with empirical oseltamivir within a median of 1 day from presentation (interquartile range, 0-1 day) and a median of 4 days after symptom onset, while 155 patients were not. No significant differences were observed in baseline characteristics between the two groups. Of the included patients, 334 (73%) were tested for influenza using PCR, and 87 (26%) had a confirmed diagnosis of influenza. Patients on oseltamivir were less likely to require rescue oxygen therapy (22.9% vs. 34.8%, p=0.007), and had shorter hospital stay (20 days vs. 27 days, p=0.01). Patients treated with oseltamivir had significantly reduced 90-day mortality on adjusted analyses (aOR: 0.87, 95% CI: 0.81-0.94, p=0.0002). Subgroup analysis revealed that the association with reduced mortality extends to patients >70 years old (aOR: 0.94, 95% CI: 0.89-0.99, p=0.02) and those with negative influenza tests (aOR: 0.81, 95% CI: 0.79, 0.84, p<0.0001).

Conclusion

Among critically ill patients with SARI, empirical treatment with oseltamivir was associated with lower mortality. These results add to the body of evidence suggesting clinical benefits of oseltamivir in managing critically ill patients with influenza-like illnesses.

Source: 

Link: https://journals.sagepub.com/doi/10.1177/20503121261478401

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Effectiveness of #Oseltamivir in Hospitalized #Children With Laboratory-Confirmed #Influenza, 2014-2023

 

Key Points

    ° Question: 

        § Does oseltamivir treatment reduce risk of intensive care unit (ICU) admission and hospital length of stay among pediatric patients hospitalized with influenza?

    ° Findings:  

        § Using a cohort study from a population-based surveillance network in 13 states across 8 influenza seasons, oseltamivir treatment was found to decrease both the likelihood of ICU admission and hospital length of stay among pediatric patients hospitalized with laboratory-confirmed influenza.

    ° Meaning:  

        § These findings support the current national recommendations from the American Academy of Pediatrics, US Centers for Disease Control and Prevention, and Infectious Diseases Society of America that recommend antiviral treatment for children hospitalized with laboratory-confirmed influenza.

Abstract

Importance  

National organizations recommend antiviral treatment for hospitalized children with influenza; however, use in this setting has recently declined. Studies of oseltamivir effectiveness in children are limited by misclassification bias, unknown symptom onset date, and incomplete capture of antiviral use prior to admission.

Objective  

To assess the association between oseltamivir receipt and intensive care unit (ICU) admission and hospital length of stay (LOS) among pediatric influenza-associated hospitalizations.

Design, Setting, and Participants  

This cohort study used data that were obtained from the Influenza Hospitalization Surveillance Network (FluSurv-NET), which conducts US population-based surveillance for laboratory-confirmed influenza hospitalizations for all ages across 13 states. The study data include seasons 2014 to 2015 through 2022 to 2023, excluding 2020 to 2021. Participants included children aged younger than 18 years who were hospitalized with laboratory-confirmed influenza and for whom a respiratory symptom onset date was available. These data were analyzed from October 2024 through May 2026.

Exposures  

Oseltamivir receipt as a time-dependent exposure.

Main Outcome(s) and Measure(s)  

The primary outcome was time from symptom onset to ICU admission. Secondary outcome was time from admission to discharge (LOS). Adjusted Cox proportional hazard models (aHR) with oseltamivir receipt as a time-dependent exposure were used.

Results  

After exclusions, 6044 influenza cases were included in the primary ICU analysis, of whom 4240 (70.2%) received oseltamivir, and 7103 cases were included in the secondary LOS analysis, of whom 5746 (80.9%) received oseltamivir. In the ICU analysis, the median (IQR) age was 3 (1-7) years, 3382 (56%) were male and 3721 (44%) were female, and 2937 (49%) had 1 or more medical comorbidity—the most common of which was asthma in 1547 children (26%). In adjusted models, compared with untreated children, oseltamivir treatment reduced the hazard of ICU admission (aHR, 0.69; 95% CI, 0.60-0.80) and shortened LOS (analyzed as hazard of hospital discharge; aHR, 1.13; 95% CI, 1.06-1.21).

Conclusions and Relevance  

In this cohort of children hospitalized with influenza, oseltamivir treatment was significantly associated with a reduced risk of ICU admission by 31% and decreased hospital LOS. These findings demonstrate the benefits of oseltamivir receipt and support current national recommendations for oseltamivir treatment as soon as possible in children hospitalized with suspected or laboratory-confirmed influenza.

Source: 

Link: https://jamanetwork.com/journals/jamapediatrics/fullarticle/2852671

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#Clinical #outcomes of early #aspirin versus non-aspirin #NSAID use in #adults hospitalized with #influenza: A retrospective study

 

Abstract

Seasonal influenza remains a major cause of morbidity and mortality worldwide. Although neuraminidase inhibitors improve outcomes, influenza-related deaths persist. We evaluated the impact of early aspirin (ASA) and non-aspirin nonsteroidal anti-inflammatory drug (NSAID) use on outcomes in adults hospitalized with influenza. This retrospective study included adults admitted to the University of Minnesota Medical Center from 2016 to 2018. Continuous variables were summarized as medians with interquartile ranges (IQRs) and categorical variables as counts and percentages. Group comparisons used Wilcoxon rank-sum, Chi-square, or Fisher’s exact tests. Analyses included case–control comparisons, assessments by vaccination status, and subgroup analyses by early ASA or NSAID use. Among 2,816 patients, 320 had laboratory-confirmed influenza, with vaccination less common among cases. Unvaccinated patients had higher rates of intensive care unit (ICU) admission (23.6% vs. 11.1%; P = 0.003) and ventilatory support (15.0% vs. 6.1%; P = 0.009). In vaccinated patients, early ASA use was associated with older age and higher in-hospital mortality, whereas early NSAID use was associated with no in-hospital deaths, better one- and three-year survival (P < 0.001), and fewer, though not statistically significant, cardiovascular complications. In unvaccinated patients, ASA use was associated with lower three-year survival (59.1% vs. 79.2%; P = 0.013), while NSAID use was associated with fewer ICU admissions and no cardiovascular or renal complications. In both vaccinated and unvaccinated adults hospitalized with influenza, early NSAID use was associated with improved survival and fewer complications, whereas ASA use was associated with worse outcomes.

Competing Interest Statement

The authors have declared no competing interest.

Source: 

Link: https://www.medrxiv.org/content/10.64898/2026.08.05.26359840v1

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#Influenza and Other Respiratory Viruses Research #References (AMEDEO, August 9 '26)

 

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#Influenza #H3N2 #epidemiology in #England during the 2025 to 2026 season: a mathematical modelling study

 

Abstract

Background

England experienced an unusually early and rapid increase in influenza A/H3N2 subclade K infections in 2025/26. Antigenic change and a fast selective sweep raised concerns over a potentially severe season. Building on analysis conducted as the subclade emerged, we aim to compare epidemic dynamics of the 2025/26 season to previous years and to model plausible epidemiological scenarios.

Methods

We compared peak epidemic growth rates and reproduction numbers across influenza seasons from 2011/12 to 2025/26 using routine surveillance data in England. Weekly epidemic growth rates were estimated using a Gaussian random walk model, and time-varying reproduction numbers using EpiEstim. We also developed an age-stratified transmission model and interactive web tool to explore scenarios varying immune escape, transmissibility, and seed date, using 2022/23 as a baseline season.

Results

Peak A/H3N2 growth rates and time-varying reproduction numbers for the 2025/26 season are of similar magnitude but earlier than previous severe seasons. Scenario analyses suggest early trends are compatible with moderate levels of immune escape, a 10% higher R0, or an earlier seed date, though it is not possible to distinguish the relative importance of these mechanisms from these data alone.

Conclusions

The 2025/26 influenza season is characterised by early but not unusually rapid growth. Earlier growth does not systematically lead to especially large epidemics due to earlier susceptible depletion combined with a dampening effect from school holidays. Laboratory evidence for antibody escape does not directly translate to large reductions in population immunity, supporting the need for complementary real-time epidemiological analyses and modelling.

Source: 

Link: https://www.nature.com/articles/s44528-026-00016-3

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Detection and characterization of #antiviral #resistant viruses during the #influenza season of 2024–25

 

ABSTRACT

During the high severity season of 2024–25, CDC with public health partners sequenced and analyzed genomes of >10,000 influenza viruses for antiviral resistance markers. Available sequence-flagged and representative viruses were tested with antivirals using in vitro assays. In the US, three oseltamivir-resistant A(H3N2) viruses had treatment-emergent neuraminidase (NA) mutations, either E119V or R292K. Oseltamivir-resistant A(H1N1)pdm09 viruses with NA-H275Y were detected in 15 states, albeit at a low frequency (0.53%). They belonged to several phylogenetic groups, with hemagglutinin (HA) subclade D.3.1 combined with either NA subclade D.1 or D.2 being most common. Based on shared sequence data, nearly all H275Y viruses from Australia, Canada, and Chile also belonged to these HA and NA subclades. Conversely, most H275Y viruses (68/81) from China belonged to HA subclade C.1.9 and NA subclade D and shared the permissive mutation R257K. Influenza polymerase acidic (PA) mutations conferring 4- to 92-fold decreased baloxavir susceptibility were detected in nine influenza A viruses. Viruses with PA-I38T showed mild attenuation of replicative fitness in three cell lines. Based on available data, NA-H275Y and PA-I38T viruses were collected from patients with no exposure to antivirals. Baseline susceptibility to all US-approved influenza antivirals remained largely unchanged compared to previous seasons. All swine-origin viruses detected in the US had adamantane resistance-conferring marker, M2-S31N, but remained susceptible to other approved antivirals. Monitoring antiviral susceptibility has substantially improved with increased sequencing capacities and bioinformatic support at public health laboratories. Information gained through influenza surveillance has been used to guide recommendations on antiviral use.

Source: 

Link: https://journals.asm.org/doi/10.1128/spectrum.01514-26

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