Influenza-Associated Hospitalizations During a High Severity Season - Influenza Hospitalization Surveillance Network, United States, 2024-25 Influenza Season.

Alissa O'Halloran,Jennifer Whitmill Habeck,Matthew Gilmer,Ryan Threlkel,Shua J Chai,Brenna Hall,Isaac Armistead,Nisha B Alden,James Meek,Kimberly Yousey-Hindes,Kyle P Openo,Lucy S Witt,Maya L Monroe,Patricia A Ryan,Lauren Leegwater,Sue Kim,Melissa McMahon,Ruth Lynfield,Khalil Harbi,Murtada Khalifa,Caroline McCahon,Grant Barney,Bridget J Anderson,Christina B Felsen,Brenda L Tesini,Nancy E Moran,Denise Ingabire-Smith,Melissa Sutton,M Andraya Hendrick,William Schaffner,H Keipp Talbot,Andrea George,Hafsa Zahid,Shikha Garg,Catherine H Bozio
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Abstract

The U.S. 2024-25 influenza season was a high-severity season characterized by co-circulation of influenza A(H1N1)pdm09 and A(H3N2) viruses. Data from the Influenza Hospitalization Surveillance Network covering 9% of the U.S. population, were analyzed to compare laboratory-confirmed influenza-associated hospitalization rates and patient clinical characteristics from the 2024-25 season with data from past seasons. Based on preliminary data from influenza-associated hospital admissions from October 1, 2024, through April 30, 2025, the cumulative influenza-associated hospitalization rate (127.1 influenza-associated hospitalizations per 100,000 population) had surpassed all end-of-season rates during the period beginning with the 2010-11 season. Cumulative 2024-25 season rates were highest among persons aged ≥75 years (598.8). Across age groups, hospitalization rates during the 2024-25 season were 1.8 to 2.8 times higher than median historical rates during the period beginning with the 2010-11 season. Among hospitalized patients, 32.4% had received an influenza vaccine, and 84.8% received antiviral treatment, though children and adolescents aged 5-17 years had the lowest proportion of antiviral receipt (61.6%). Similar to past seasons, most patients hospitalized with influenza during the 2024-25 season (89.1%) had one or more underlying medical conditions, 16.8% were admitted to an intensive care unit, 6.1% received invasive mechanical ventilation, and 3.0% died in hospital. Seasonal influenza viruses can cause severe disease, particularly among persons who are at higher risk for complications. CDC recommends that all persons aged ≥6 months who do not have contraindications receive an annual influenza vaccine and that all hospitalized patients with influenza receive timely antiviral treatment to reduce the risk for complications.
高严重季节流感相关住院情况——流感住院监测网络,美国,2024-25流感季节
美国2024-25年流感季节是a (H1N1)pdm09和a (H3N2)流感病毒共循环的高发季节。对覆盖美国9%人口的流感住院监测网络的数据进行分析,比较2024-25流感季节实验室确认的流感相关住院率和患者临床特征与过去流感季节的数据。根据从2024年10月1日至2025年4月30日流感相关住院的初步数据,流感相关的累计住院率(每10万人中有127.1例流感相关住院)超过了从2010-11流感季开始的所有季节末的住院率。在年龄≥75岁的人群中,累积2024-25季发病率最高(598.8)。在各年龄组中,2024-25年流感季的住院率比从2010-11年流感季开始的历史中位数高出1.8至2.8倍。在住院患者中,32.4%接受了流感疫苗接种,84.8%接受了抗病毒治疗,但5-17岁的儿童和青少年接受抗病毒治疗的比例最低(61.6%)。与过去的流感季节相似,在2024-25流感季节,大多数因流感住院的患者(89.1%)患有一种或多种潜在疾病,16.8%的患者住进了重症监护病房,6.1%的患者接受了有创机械通气,3.0%的患者在医院死亡。季节性流感病毒可导致严重疾病,特别是在并发症风险较高的人群中。CDC建议所有年龄≥6个月且无禁忌症的人每年接种流感疫苗,所有流感住院患者及时接受抗病毒治疗以降低并发症的风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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