Special Report

How Bad Is the Flu Season in Every State?

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The Centers for Disease Control and Prevention said during its latest reporting week that the geographic spread of influenza in every state except for Hawaii and Oregon was “widespread.”

This year’s flu season may still not have peaked and remains considerably worse than in recent years. During the first week of February, 7.7% of doctor visits nationwide were for flu or flu-like illnesses, versus the off-season average of 2.2%. This is the highest level since the 2009 H1N1 pandemic.

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Fears of a flu pandemic emerged early in the United States after hospitalizations spiked at the start of this year’s flu season.

The Atlanta-based agency said in a media advisory on Feb. 9 that the hospitalization rate for the fifth week of the 2017-2018 season is 59.9 per 100,000, above the corresponding period of 50.9 for the 2014-2015 season. The overall cumulative rate is approaching the overall end-of-season hospitalization rate of 64.2 for 2014-2015, the season with the highest final cumulative rate of laboratory-confirmed influenza hospitalizations.

A flu pandemic can emerge anywhere and spread globally. The flu pandemic of 1918 killed as many as 100 million people — approximately 675,000 in the United States. Three flu pandemics have occurred since then, in 1957, 1968, and in 2009, when H1N1 (also known as the swine flu) killed approximately 12,469 Americans. The most prevalent strain of this year’s flu season has been identified as H3N2.

In an email to 24/7 Wall St., spokesperson for the Centers for Disease Control and Prevention Ian Branam said, “H3N2-predominant seasons have been associated with more severe illness especially among people older than 65 years and children.” So far this flu season, children under the age of five, 50-64 year olds, and senior citizens are the most at risk groups. People 65 and older are over four times more likely to be hospitalized with the flu than the average American.

While the current flu season is nowhere near 2009 levels, when flu cases spiked higher and earlier, the CDC is anticipating elevated influenza activity to continue for several more weeks. “This season is notable for the sheer volume of flu that is occurring in most of the country at the same time,” said Branam.

24/7 Wall St. reviewed influenza activity levels in every state using data from the influenza division of the CDC. Activity levels are as of the second week of January. Specifically, they measure the percentage of current outpatients reporting flu and flu-like illnesses compared to such reports over the past non-flu seasons. States with high activity levels are those where flu cases have exceeded the respective by the most.

Click here to see the how bad the flu season is in every state.
Click here to see our detailed findings and methodology.

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Source: Thinkstock

1. Alabama
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 5.9% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 16.1% (20th highest)
> 5 and under population: 7.2% (21st lowest)

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Source: Thinkstock

2. Alaska
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.8% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 10.2% (the lowest)
> 5 and under population: 8.4% (5th highest)

Source: Thinkstock

3. Arizona
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 4.0% of patients
> Flu-like symptoms in offseason (regional): 2.4% of patients
> 65 and over population: 16.9% (10th highest)
> 5 and under population: 7.5% (19th highest)

Source: Thinkstock

4. Arkansas
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 4.6% of patients
> Flu-like symptoms in offseason (regional): 4.2% of patients
> 65 and over population: 16.3% (16th highest)
> 5 and under population: 7.5% (18th highest)

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Source: Thinkstock

5. California
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.1% of patients
> Flu-like symptoms in offseason (regional): 2.4% of patients
> 65 and over population: 13.6% (6th lowest)
> 5 and under population: 7.6% (15th highest)

Source: Thinkstock

6. Colorado
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.7% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 13.4% (5th lowest)
> 5 and under population: 7.2% (24th lowest)

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Source: Thinkstock

7. Connecticut
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.9% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 16.1% (19th highest)
> 5 and under population: 6.2% (5th lowest)

Source: Thinkstock

8. Delaware
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 0.7% of patients
> Flu-like symptoms in offseason (regional): 2.0% of patients
> 65 and over population: 17.5% (6th highest)
> 5 and under population: 6.8% (10th lowest)

Source: Thinkstock

9. Florida
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): Insufficient Data
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 19.8% (the highest)
> 5 and under population: 6.5% (7th lowest)

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Source: Schnitzel_bank / Flickr

10. Georgia
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 5.7% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 13.2% (4th lowest)
> 5 and under population: 7.6% (17th highest)

Source: Thinkstock

11. Hawaii
> Flu-like illness activity level: Moderate
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 4.5% of patients
> Flu-like symptoms in offseason (regional): 2.4% of patients
> 65 and over population: 17.0% (8th highest)
> 5 and under population: 7.6% (12th highest)

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Source: Thinkstock

12. Idaho
> Flu-like illness activity level: Moderate
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.6% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 15.2% (21st lowest)
> 5 and under population: 8.1% (7th highest)

Source: Thinkstock

13. Illinois
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.0% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 14.6% (11th lowest)
> 5 and under population: 7.2% (22nd lowest)

Source: Thinkstock

14. Indiana
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.5% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 15.0% (15th lowest)
> 5 and under population: 7.6% (14th highest)

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Source: Thinkstock

15. Iowa
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.7% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 16.4% (15th highest)
> 5 and under population: 7.6% (16th highest)

Source: benkrut / iStock

16. Kansas
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 4.6% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.1% (20th lowest)
> 5 and under population: 8.1% (8th highest)

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Source: Thinkstock

17. Kentucky
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 4.9% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.5% (25th lowest)
> 5 and under population: 7.2% (25th lowest)

Source: faungg's photos / Flickr

18. Louisiana
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 6.3% of patients
> Flu-like symptoms in offseason (regional): 4.2% of patients
> 65 and over population: 14.4% (7th lowest)
> 5 and under population: 7.8% (10th highest)

Source: Thinkstock

19. Maine
> Flu-like illness activity level: Insufficient Data
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 0.8% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 19.3% (2nd highest)
> 5 and under population: 5.9% (3rd lowest)

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Source: Thinkstock

20. Maryland
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.3% of patients
> Flu-like symptoms in offseason (regional): 2.0% of patients
> 65 and over population: 14.6% (9th lowest)
> 5 and under population: 7.2% (23rd lowest)

Source: https://www.flickr.com/photos/masstravel/

21. Massachusetts
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.1% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 15.8% (24th highest)
> 5 and under population: 6.3% (6th lowest)

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Source: Thinkstock

22. Michigan
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.4% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 16.2% (18th highest)
> 5 and under population: 6.9% (12th lowest)

Source: Thinkstock

23. Minnesota
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.5% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 15.0% (18th lowest)
> 5 and under population: 7.6% (13th highest)

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24. Mississippi
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 7.1% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.0% (19th lowest)
> 5 and under population: 7.5% (20th highest)

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Source: Thinkstock

25. Missouri
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.6% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 16.0% (22nd highest)
> 5 and under population: 7.3% (25th highest)

Source: Thinkstock

26. Montana
> Flu-like illness activity level: Minimal
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 0.2% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 17.6% (5th highest)
> 5 and under population: 7.1% (19th lowest)

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Source: Thinkstock

27. Nebraska
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.4% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.0% (14th lowest)
> 5 and under population: 8.3% (6th highest)

Source: Thinkstock

28. Nevada
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.8% of patients
> Flu-like symptoms in offseason (regional): 2.4% of patients
> 65 and over population: 15.0% (17th lowest)
> 5 and under population: 7.4% (21st highest)

Source: Thinkstock

29. New Hampshire
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.3% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 17.0% (9th highest)
> 5 and under population: 5.9% (2nd lowest)

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Source: Thinkstock

30. New Jersey
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.9% of patients
> Flu-like symptoms in offseason (regional): 3.1% of patients
> 65 and over population: 15.3% (22nd lowest)
> 5 and under population: 7.1% (17th lowest)

Source: Thinkstock

31. New Mexico
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.1% of patients
> Flu-like symptoms in offseason (regional): 4.2% of patients
> 65 and over population: 16.4% (14th highest)
> 5 and under population: 7.3% (23rd highest)

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Source: Thinkstock

32. New York
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.5% of patients
> Flu-like symptoms in offseason (regional): 3.1% of patients
> 65 and over population: 15.3% (23rd lowest)
> 5 and under population: 7.0% (14th lowest)

Source: Thinkstock

33. North Carolina
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.9% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.5% (24th lowest)
> 5 and under population: 7.0% (15th lowest)

Source: Thinkstock

34. North Dakota
> Flu-like illness activity level: Minimal
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.9% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 14.5% (8th lowest)
> 5 and under population: 8.7% (2nd highest)

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Source: Thinkstock

35. Ohio
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.8% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 16.2% (17th highest)
> 5 and under population: 7.1% (18th lowest)

Source: Thinkstock

36. Oklahoma
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 5.0% of patients
> Flu-like symptoms in offseason (regional): 4.2% of patients
> 65 and over population: 15.0% (16th lowest)
> 5 and under population: 8.1% (9th highest)

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37. Oregon
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.7% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 16.8% (11th highest)
> 5 and under population: 6.9% (11th lowest)

Source: Thinkstock

38. Pennsylvania
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.0% of patients
> Flu-like symptoms in offseason (regional): 2.0% of patients
> 65 and over population: 17.4% (7th highest)
> 5 and under population: 6.7% (9th lowest)

Source: Thinkstock

39. Rhode Island
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.8% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 16.5% (13th highest)
> 5 and under population: 6.2% (4th lowest)

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Source: Thinkstock

40. South Carolina
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 5.6% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 16.7% (12th highest)
> 5 and under population: 7.0% (16th lowest)

Source: Thinkstock

41. South Dakota
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.7% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 15.9% (23rd highest)
> 5 and under population: 8.5% (4th highest)

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Source: Thinkstock

42. Tennessee
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.9% of patients
> Flu-like symptoms in offseason (regional): 1.9% of patients
> 65 and over population: 15.7% (25th highest)
> 5 and under population: 7.3% (24th highest)

Source: Lindsay Attaway / Flickr

43. Texas
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 7.6% of patients
> Flu-like symptoms in offseason (regional): 4.2% of patients
> 65 and over population: 12.0% (3rd lowest)
> 5 and under population: 8.6% (3rd highest)

Source: Thinkstock

44. Utah
> Flu-like illness activity level: Low
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 0.7% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 10.5% (2nd lowest)
> 5 and under population: 10.0% (the highest)

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Source: https://www.flickr.com/photos/mar_ibert/

45. Vermont
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.9% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 18.2% (4th highest)
> 5 and under population: 5.8% (the lowest)

Source: Thinkstock

46. Virginia
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.5% of patients
> Flu-like symptoms in offseason (regional): 2.0% of patients
> 65 and over population: 14.6% (10th lowest)
> 5 and under population: 7.2% (20th lowest)

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Source: Thinkstock

47. Washington
> Flu-like illness activity level: Moderate
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 1.7% of patients
> Flu-like symptoms in offseason (regional): 1.4% of patients
> 65 and over population: 14.8% (12th lowest)
> 5 and under population: 7.4% (22nd highest)

Source: Thinkstock

48. West Virginia
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.8% of patients
> Flu-like symptoms in offseason (regional): 2.0% of patients
> 65 and over population: 18.8% (3rd highest)
> 5 and under population: 6.6% (8th lowest)

Source: Thinkstock

49. Wisconsin
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 2.5% of patients
> Flu-like symptoms in offseason (regional): 1.8% of patients
> 65 and over population: 16.0% (21st highest)
> 5 and under population: 7.0% (13th lowest)

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Source: Justinreznick / iStock

50. Wyoming
> Flu-like illness activity level: High
> Flu-like symptoms so far this flu season (Oct 1- Feb 3): 3.1% of patients
> Flu-like symptoms in offseason (regional): 1.3% of patients
> 65 and over population: 15.0% (13th lowest)
> 5 and under population: 7.8% (11th highest)

Detailed Findings & Methodology

Relatively high numbers of cases have been reported in most of the country. New York City, Puerto Rico, and 32 states reported high flu or flu-like illness activity. Every state except for Hawaii had widespread influenza activity as of the second week of January.

CDC epidemiologist Lynnette Brammer, in an interview with 24/7 Wall St., noted activity levels could be from illnesses other than the flu. However, “you don’t get to high [flu activity levels] with something other than influenza,” she added.

The flu activity levels listed here are relative to what you would expect them to be if flu were not circulating. Flu seasons vary considerably, however, and a host of factors make mapping the spread and intensity of influenza in order to compare states a surprisingly difficult task.

“I’ve been doing this for more than 20 years and I can’t tell you why in a given year one state gets hit really hard and another one doesn’t get hit as hard,” said Brammer.

To identify the incidence of the flu in every state, 24/7 Wall St. reviewed the latest weekly influenza surveillance report prepared by the influenza division of the CDC. Influenza-like Illness activity levels (minimal, low, moderate, and high) are based on the difference between current and off-season average proportions of outpatient visits to health providers for flu-like illnesses. It is important to note that outbreaks occurring in a single city could cause a state to display high activity levels, and data collected may disproportionately represent certain populations within a state and therefore may not accurately capture influenza activity for the whole state. The percentage of patients with flu-like illnesses so far this flu season (October 1, 2017 through February 3, 2018) was calculated by 24/7 Wall St. using data reported weekly to the CDC.

Activity levels for states are measured against regional average patient visits for flu-like illnesses. Across the 10 regions, these baselines range from 1.3% of patients in the Denver region (Colorado, Montana, North Dakota, South Dakota, Utah, and Wyoming) to 4.2% in the Dallas region (Arkansas, Louisiana, New Mexico, Oklahoma, and Texas).

Each state’s 65 and over population was obtained from the U.S. Census Bureau’s 2016 American Community Survey. The number of primary care physicians for every 100,000 people in each state came from County Health Rankings & Roadmaps, a collaboration between the Robert Wood Johnson Foundation and the University of Wisconsin Population Health Institute.

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