Influenza is a respiratory infection associated with significant clinical, humanistic, and economic burden for patients, caregivers, and healthcare systems worldwide [1]. Each year there are an estimated 5 million cases of severe illness worldwide, and up to 650,000 deaths attributed to influenza [2, 3].
How many people died from the flu in 2017?
The 2017–18 flu season had more related deaths than any other season: an estimated 52,000. According to CDC data, the flu led to 15 million medical visits, over 360,000 hospitalizations, and 21,410 deaths during the 2022–23 season.
What is the flu type A?
Most people who have flu are infected with the influenza type A virus. Symptoms of influenza A infection include fever, chills, muscle pains, coughing and a sore throat. Influenza A is diagnosed through a PCR test, which can tell influenza A apart from influenza B and other similar viruses.
How effective is the flu vaccine?
Reviews of past studies have found that the flu vaccine lowers the risk of flu illness by 40% to 60% when the vaccine matches the spreading flu viruses. Even when the vaccine doesn't completely prevent the flu, it may lessen the severity of your illness.
There are around a billion cases of seasonal influenza annually, including 3–5 million cases of severe illness. It causes 290 000 to 650 000 respiratory deaths annually.
Overview
On This Page
•2021–2022 Burden Estimates
•Burden Estimates Limitations
•Tables
•References
The overall burden of influenza (flu) for the 2021-2022 season was an estimated 9.4 million flu illnesses, 4.3 million flu-related medical visits, 100,000 flu-related hospitalizations, and 4,900 flu deaths (Table 1).
cdc.gov
2021–2022 Burden Estimates
Since the emergence of SARS-CoV-2, influenza activity has been lower than observed before the pandemic. Compared with influenza seasons prior to pandemic, the 2021–2022 influenza season was mild and occurred in two waves, with a higher number of hospitalizations in the second wave. Influenza activity in the United States during the 2021–2022 season began to increase in November, declined in January 2022, increased again in March 2022 and remained elevated until mid-June 2022. The season was characterized by two distinct waves and predominately influenza A virus circulation. Overall, influenza A(H3N2) viruses were the most commonly detected influenza viruses this season. The 2021-22 season is described as having low severity**; however, the effect of influenza differed by age group and the severity of the season in some age groups was higher– hospitalization rates among older adults aged ≥65 years old were higher compared with other age groups (5).
CDC estimates that the burden of illness during the 2021–2022 season was low with an estimated 9.4 million people sick with flu, 4.3 million visits to a health care provider for flu, 100,000 hospitalizations for flu, and 4,900 flu deaths (Table 1). The number of cases of influenza-associated illness, medically attended illnesses, hospitalizations, and deaths were the lowest since the 2011-2012 season which was the first full season following the influenza A(H1N1)pdm09 pandemic (6). Adoption of mitigation measures intended to prevent the spread of COVID-19 may have also impacted the timing or severity of influenza activity during the 2021-2022 season.
CDC’s estimates of hospitalizations and mortality associated with the 2021–2022 influenza season show that despite the co-circulation of SARS-CoV-2 and other respiratory viruses, influenza viruses do still cause severe disease and death. Older adults accounted for 84% of deaths, which is similar to recent seasons before the COVID-19 pandemic. These findings continue to highlight the fact that older adults are particularly vulnerable to severe disease with influenza virus infection and that influenza prevention measures such as vaccination are important to reducing the impact of the seasonal epidemics on the population and healthcare system.
Deaths in children with laboratory-confirmed influenza virus infection have been a reportable disease in the United States since 2004; 49 deaths were reported for the 2021-22 season as of October 31, 2023. Although it is possible that reported deaths may under-estimate the true number of deaths for this age group, no deaths in children (aged <18 years) were observed through the Influenza Hospital Surveillance Network (FluSurv-NET) during the 2021-2022 influenza season. As a result, it was not possible to estimate deaths in this age group.
Conclusion
During the 2021-2022 influenza season, CDC estimates that influenza was associated with 9.4 million illnesses, 4.3 million medical visits, 100,000 hospitalizations, and 4,900 deaths. The influenza burden was similar to the burden observed during the 2011-2012 season.
cdc.gov
Why did the estimates for the 2021-2022 flu season change compared with previous estimates for this season?
CDC’s model used to estimate the burden of flu includes information collected about flu testing practices and vital records death data. Because current testing and death data were not available at the time of estimation (it takes approximately two years to finalize information on flu testing practices), the estimates that were previously published on the CDC website were made using testing information from prior flu seasons.
The 2021-2022 burden estimates are still preliminary and may change as more information for the season becomes available.
cdc.gov
Burden Estimates Limitations
These estimates are subject to some limitations.
cdc.gov
Tables
*Some of the data used to calculate burden estimates are incomplete or not yet available. These estimates will change as those data become available and the estimates are updated.
**No pediatric deaths were reported in the surveillance system used to estimate the flu death burden; thus, our model was unable to estimate any pediatric deaths due to flu during the 2021-22 season [the Influenza Hospital Surveillance Network (FluSurv-NET)]. However, 49 pediatric deaths (as of October 31, 2023) were reported through a different surveillance system for reporting of pediatric deaths due to flu (the Influenza-associated Pediatric Mortality Surveillance System).
cdc.gov
References:
1.Reed C, Chaves SS, Daily Kirley P, Emerson R, Aragon D, Hancock EB, et al. Estimating influenza disease burden from population-based surveillance data in the United States. PLoS One. 2015;10(3):e0118369.
2.Rolfes MA, Foppa IM, Garg S, et al. Annual estimates of the burden of seasonal influenza in the United States: A tool for strengthening influenza surveillance and preparedness. Influenza Other Respir Viruses 2018; 12(1): 132–7.
3.Centers for Disease Control and Prevention. Estimated influenza illnesses and hospitalizations averted by influenza vaccination – United States, 2012-13 influenza season. MMWR Morb Mortal Wkly Rep. 2013 Dec 13;62(49):997-1000.
4.Reed C, Kim IK, Singleton JA, Chaves SS, Flannery B, Finelli L, et al. Estimated influenza illnesses and hospitalizations averted by vaccination–United States, 2013-14 influenza season. MMWR Morb Mortal Wkly Rep. 2014 Dec 12;63(49):1151-4.
5.Merced-Morales A, Daly P, Abd Elal AI, et al. Influenza Activity and Composition of the 2022–23 Influenza Vaccine — United States, 2021–22 Season. MMWR Morb Mortal Wkly Rep 2022;71:913–919. DOI: http://dx.doi.org/10.15585/mmwr.mm7129a1
6.Update: Influenza Activity — United States, 2011–12 Season and Composition of the 2012–13 Influenza Vaccine https://www.cdc.gov/mmwr/preview/mmwrhtml/mm6122a4.htm
cdc.gov
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Global mortality associated with seasonal influenza epidemics
Results We estimated an average of 389 000 (uncertainty range. 294 000-518000) respiratory deaths were associated with influenza globally each year during the
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Flu deaths in UK hit five year high last winter
22 июн. 2023 г. Elisabeth Mahase. Nearly 15 000 excess deaths associated with influenza were reported in the most recent flu season of.
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OECD iLibrary
People with COPD are also more susceptible to influenza and pneumonia. Pneumonia was responsible for nearly. 140 000 deaths in EU countries in 2015 accounting
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Should flu vaccination be mandatory for healthcare workers?
49 000 deaths annually to flu.30 However its final data for 2010 show that of the 50 097 deaths recorded for flu and pneumonia combined
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Estimating the burden of influenza‐associated hospitalizations and
9 сент. 2017 г. The annual mortality rate for the period was 0.08/100 000 person- year for <5 years; 0.3/100 000 person- year for people between 5 and 64 years; ...
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Death and its main causes in Switzerland 2015 FSO News
The increase is due to the ageing of the population (an additional 500 deaths) the flu epidemic The infant mortality rate is 41 deaths per 10 000 live births ...
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The 2017 NSW Influenza Season
Table 4 Number of deaths and death rate per 100 000 population by gender and age group for NSW residents with a primary diagnosis of influenza or pneumonia for
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Influenza Pandemic Preparedness: Current Global Strategy
19 февр. 2019 г. flu deaths. U.S. Influenza Season 2018-2019. Page 9. I. PB2. j120E11. ' 60 ... 1 000 000-3 600 000. 5000-19 000. 50-300. Burden of Influenza in ...
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Global
We report here a third estimate from the Global Influenza Mortality project (GLaMOR)
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Kingstons experience with Spanish influenza: explaining the
1 апр. 2019 г. 100 000 population (Box 1). To discuss the epidemic in Kingston ... Box 1: Influenza deaths throughout Canadian cities originally published by.
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Relations entre lémergence de maladies infectieuses et les
Mortality and causes of death in South Africa: Findings from death
per 1 000 population in that age group while the median ages at death Among the age group 1–4 the three leading causes of death were influenza and ...
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Covid and flu: what do the numbers tell us about morbidity and
14 oct. 2021 estimated that in the US there were 1.8 deaths from flu per 100 000 population between 1999 and 2019.8. The estimated death rate from covid ...
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Global
regional estimates of influenza mortality burden and explore mor- 294 000-518000) respiratory deaths were associated with influenza.
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The 2017 NSW Influenza Season - A supplementary analysis of
analysis of influenza-associated hospitalisations and deaths in 2017. pneumonia (ICD J12-J18.9) and combined
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Antimicrobial Resistance Tackling the Burden in the European Union
33 000 deaths and costs about 1.1 billion 27 000 deaths per year in EU/EEA countries. ... of influenza tuberculosis and HIV/AIDS combined.
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Influenza-associated excess respiratory mortality in China 2010–15
4 sept. 2019 global mortality burden attributable to influenza virus infections. ... deaths. The mean excess respiratory mortality rates per 100 000 ...
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More than 670 000 persons died in the EU from respiratory diseases
10 sept. 2015 Influenza. 0.3%. Other. 15.7%. Deaths due to respiratory diseases in the EU by disease and gender
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Incidence of influenza-associated mortality and hospitalizations in
5 déc. 2012 If all of these excess deaths were associated with influenza the influenza- associated mortality rate was 6 ? 100 000 person-years (95% CI.
1 FAQs WHO Estimate of Respiratory Deaths due to Seasonal
How many people die of respiratory diseases associated with seasonal influenza each year? WHO estimates that 290 000-650 000 respiratory deaths occur
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US had record flu deaths last year, says CDC - The BMJ
1 oct 2018 · A record number of US patients died from flu last year, with 80 000 deaths recorded in 2017-18, says the director of the Centers for Disease
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Seasonal Influenza – Basic facts - European Centre for Disease
which reduces their risks of complications, severe disease and death Some basics on flu Human influenza viruses reproduce and transmit easily from one
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Real-time estimation of the influenza-associated excess mortality in
Influenza virus infections cause a considerable impact on public health While most infections are mild, a small fraction is severe, resulting in hospitalisation or even death Worldwide, ∼290 000 to 650 000 deaths are attributable to influenza each year [1]
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Influenza and pneumonia deaths by influenza season and age - CDC
Division of Vital Statistics, Mortality Data Table page 1 of 2 Influenza season Total death count Influenza deaths Pneumonia deaths 2008–2009 1,585,938
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Trends in Pneumonia and Influenza Morbidity and Mortality
There were 56,832 deaths due to pneumonia and influenza in 2013, which combined were the eighth leading cause of death in the U S While the age‐ adjusted
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Influenza:
24 mar 2016 · Captain of the Men of Death Up to 500 000 died; 900 000 orphans https:// www medicalbrief co za/archives/flu-injection-lowers-mortality-
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Revisiting the 1957 and 1968 influenza pandemics - The Lancet
13 jui 2020 · 100 000 people in the USA, with half the deaths among individuals estimates that the 1968 pandemic, due to an H3N2 influenza virus, was
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[PDF] Full Text - PDF - global
Background Until recently, the World Health Organization (WHO) estimated the annual mortality burden of influenza to be 250 000 to 500 000 all cause deaths
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Revisiting the 1957 and 1968 influenza pandemics - The Lancet
Jun 13, 2020 · killing more than 30 000 individuals in the UK and 100 000 people in the USA, with half the deaths among individuals younger than 65
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US had record flu deaths last year, says CDC - The BMJ
Oct 1, 2018 · A record number of US patients died from flu last year, with 80 000 deaths recorded in 2017 18, says the director of the Centers for Disease
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mortality from respiratory diseases - OECD iLibrary
to influenza and pneumonia Pneumonia was responsible for nearly 140 000 deaths in EU countries in 2015, accounting for over 30 of all respiratory disease
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Real-time estimation of the influenza-associated excess mortality in
are mild, a small fraction is severe, resulting in hospitalisation or even death Worldwide, ∼290 000 to 650 000 deaths are attributable to influenza each year [ 1]
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[PDF] The Global Influenza Surveillance Network
In regular "seasonal" epidemics, up to 15 percent of the population can be affected resulting in up to 500 000 deaths every year In the tropics, influenza outbreaks
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