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[32] [61] Another unusual feature of this pandemic was that it mostly killed young adults, with 99% of pandemic influenza deaths occurring in people under 65, and more than half in young adults 20 to 40 years old. [68] This is unusual since influenza is normally most deadly to the very young (under age 2) and the very old (over age 70).
US influenza statistics by flu season. From the Centers for Disease Control and Prevention page called "Disease Burden of Flu": "Each year CDC estimates the burden of influenza in the U.S. CDC uses modeling to estimate the number of flu illnesses, medical visits, hospitalizations, and deaths related to flu that occurred in a given season.
The Child Behavior Checklist (CBCL) is a widely used caregiver report form identifying problem behavior in children. [ 1 ] [ 2 ] It is widely used in both research and clinical practice with youths. It has been translated into more than 90 languages, [ 3 ] and normative data are available integrating information from multiple societies.
A 9-year-old girl from Clermont County is the first child in the state to die from influenza-related complications in the 2023-2024 flu season, according to the Ohio Department of Health.
In a typical year, influenza viruses infect 5–15% of the global population, [3] [62] causing 3–5 million cases of severe illness annually [1] [2] and accounting for 290,000–650,000 deaths each year due to respiratory illness. [3] [4] [67] 5–10% of adults and 20–30% of children contract influenza each year. [23]
H5N1 influenza virus is a type of influenza A virus which mostly infects birds. H5N1 flu is a concern because its global spread may constitute a pandemic threat. The yardstick for human mortality from H5N1 is the case-fatality rate (CFR); the ratio of the number of confirmed human deaths resulting from infection of H5N1 to the number of those confirmed cases of infection with the virus.
There were approximately 50,000 excess influenza and pneumonia deaths in the country, or about half of the mortality attributed to the 1920 epidemic. [40] The 1946–1947 flu season was characterized by a previously unheard of phenomenon. The first influenza vaccine came into use in the 1940s.
The second wave came with the influx of influenza A viruses, such as H1N1. [3] According to preliminary burden estimates for the 2019–2020 flu season (October 1, 2019 through April 4, 2020) there were between 39 and 56 million flu cases; 18–26 million doctor visits; 410,000 to 740,000 hospitalizations, and between 24,000 and 62,000 deaths.