When was the peak of influenza?
Most of the time flu activity peaks between December and February, although significant activity can last as late as May. The figure below shows peak flu activity in the United States by month for the 1982-1983 through 2019-2020 flu seasons.
What are the stats on the flu?
The flu has resulted in 9.3 million to 49 million illnesses each year in the United States since 2010. Each year, on average, five to 20 percent of the United States population gets the flu. It is estimated that the flu results in 31.4 million outpatient visits and more than 200,000 hospitalizations each year.
How many flu outbreaks have there been?
Four pandemics have occurred in the last 100 years, in 1918, 1957, 1968 and 2009. Scientists predict that another pandemic will happen, although they cannot say exactly when.
How many cases of the flu per year?
* 2019 to 2020 season is a preliminary estimate.
| Season | Symptomatic Illnesses | |
|---|---|---|
| Estimate | 95% UI | |
| 2017-2018 | 41,000,000 | (35,500,000 – 53,000,000) |
| 2018-2019 | 29,000,000 | (25,000,000 – 40,000,000) |
| 2019-2020* | 35,000,000 | (30,000,000 – 49,000,000) |
Where is influenza most common in the world?
Where is it most common? A study in 2015 looked into where influenza is most common, alongside how it spreads around the globe. While there are cases of it appearing all around the world, scientists found that it is far more prominent in the east than in the west, particularly in Southeast Asia.
What was the worst flu epidemic?
There have been six major influenza epidemics in the last 140 years, with the 1918 flu pandemic being the most severe; this is estimated to have been responsible for the deaths of 50–100 million people. The most recent, the 2009 swine flu pandemic, resulted in under 300,000 deaths and is considered relatively mild.
When did the influenza season start and end in 2015?
Influenza A viruses were more commonly detected until late February 2015, after which there was substantial influenza B activity. Influenza B viruses predominated from the week ending February 28, 2015 (week 8) through the week ending May 23, 2015 (week 20). The relative proportion of each type and subtype varied by geographic region and by week.
Are there any changes to the data in the influenza data?
All data are preliminary and may change as more reports are received. Influenza surveillance data the way you want it. This series of dynamic visualizations allow any Internet user to access influenza information collected by CDC’s monitoring systems.
When was the last time the flu report was updated?
The data were reanalyzed and updated results were posted in the May 17, 2008, week 20 report. Other influenza surveillance systems are unaffected.
What is a weekly influenza surveillance report?
A weekly influenza surveillance report prepared by the Influenza Division. All data are preliminary and may change as more reports are received. Influenza surveillance data the way you want it.