ArticleClinical infectious diseases : an official publication of the Infectious Diseases Society of America2026
Prevalence and Outcomes of Bacterial Co-detections by Blood Culture Among Children and Adults Hospitalized With Laboratory-confirmed Influenza, Influenza Hospitalization Surveillance Network, 2022-2024.
Article in Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundInfluenza predisposes individuals to bacterial co-infections, which can result in disseminated infection and bacteremia. We describe the epidemiology and outcomes of blood culture co-detections among those hospitalized with influenza over 2 influenza seasons.
methodsWe sampled individuals of all ages from FluSurv-NET, a US population-based surveillance network of persons hospitalized with laboratory-confirmed influenza, during the 2022-2023 and 2023-2024 seasons. Surveillance staff collected information on bacterial blood cultures within 3 days before or 3 days following admission. We described patient characteristics and in-hospital outcomes, stratified by culture positivity, number of positive cultures, and type of co-detection, using unweighted counts and weighted percentages to account for the complex survey design.
resultsOverall, 14 316 patients were included, with a median (interquartile range) age of 57 (14-74) years, 53.6% female, 52.0% non-Hispanic White, and 25.6% with ≥4 categories of underlying medical conditions. Of these, 50.8% had ≥1 blood cultures obtained and 5.2% overall had ≥1 bacterial co-detections. Intensive care unit admission occurred for 9.6%, 19.2%, 31.2%, and 47.9% among patients with no blood cultures, negative cultures, 1 co-detection, and >1 co-detection documented, respectively; in-hospital mortality occurred in 1.5%, 3.3%, 9.4%, and 14.5%, respectively. Among patients with positive cultures, 22.1% had Staphylococcus aureus and 7.5% had Streptococcus pneumoniae co-detections; both were associated with severe illness (with 22.4% in-hospital mortality each). DISCUSSION: Bacterial co-detections in persons hospitalized with influenza were associated with poor in-hospital outcomes. Efforts to prevent severe influenza and bacterial co-infections, including through vaccination, may reduce substantial morbidity and mortality from influenza.
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