Weekly United States. Influenza Surveillance Report

Weekly United States. Influenza Surveillance Report


A total of 2,339 laboratory-confirmed influenza-associated hospitalizations were reported by FluSurv-NET sites between October 1, 2021, and April 2, 2022. The overall cumulative hospitalization rate was 8.0 per 100,000 population. This cumulative hospitalization rate is higher than the cumulative in-season hospitalization rate observed in week 13 during the 2020-2021 season (0.7 per 100,000), but lower than the in-season rates observed in week 13 during the 4 seasons preceding the COVID-19 pandemic (these ranged from 56.4 to 99.9 per 100,000 during the 2016-17 through 2019-20 seasons).

When examining rates by age, the highest rate of hospitalization per 100,000 population was among adults aged 65 and older (21.8). Among adults aged 65 and older, rates were highest among adults aged 85 and older (43.4). Among persons aged less than 65 years, hospitalization rates per 100,000 population were highest among children aged 0-4 years (10.7) followed by adults aged 50-64 years (7.3). When examining rates by race and ethnicity, the highest rate of hospitalization per 100,000 population was among non-Hispanic American Indian or Alaska Native persons (10.8), followed by non-Hispanic Black persons (9.6).

Among 2,339 hospitalizations, 2,225 (95.1%) were associated with influenza A virus, 99 (4.2%) with influenza B virus, 4 (0.2%) with influenza A virus and influenza B virus co-infection, and 11 (0.5%) with influenza virus for which the type was not determined. Among 589 hospitalizations with influenza A subtype information, 582 (98.8%) were A(H3N2), and 7 (1.2%) were A(H1N1)pdm09. Based on preliminary data, of the 2,339 laboratory-confirmed influenza-associated hospitalizations, 3.2% also tested positive for SARS-CoV-2.

Among 1,114 hospitalized adults with information on underlying medical conditions, 93.1% had at least one reported underlying medical condition, the most commonly reported were hypertension, cardiovascular disease, metabolic disorder, and obesity. Among 166 hospitalized children with information on underlying medical conditions, 71.7% had at least one reported underlying medical condition; the most commonly reported condition was asthma.


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Additional FluSurv-NET hospitalization surveillance information for current and past seasons and additional age groups:
Surveillance Methods |FluView Interactive: Rates by Age, Sex, and Race/Ethnicity or Data on Patient Characteristics

FluSurv-Net data are used to generate national estimates of the total numbers of influenza cases, medical visits, hospitalizations, and deaths. This season, CDC is reporting preliminary cumulative in-season estimates, which are available at https://www.The Centers for Disease Control and Prevention headquartered in Atlanta (CDC).gov/flu/about/burden/preliminary-in-season-estimates.htm

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