Weekly Influenza & Respiratory Illness Activity Report

Weekly Influenza & Respiratory Illness Activity Report

Week Ending Dec. 30, 2023 | WEEK 52

A summary of influenza surveillance indicators prepared by the Division of Infectious Disease Epidemiology Prevention & Control. All data are preliminary and may change as more information is received.

Minnesota Influenza Key Statistics

Percent of molecular laboratory tests positive

14.7%

Hospitalizations

908

Most common strain

Influenza A

School outbreaks

49

Long-term care outbreaks

13

Pediatric influenza-associated deaths

0

Contents

Hospitalized Influenza Surveillance.............................................................................................................2 Influenza-Associated Death Surveillance....................................................................................................4 Respiratory Disease Outbreak Surveillance: School Outbreaks..................................................................5 Respiratory Disease Outbreak Surveillance: LTC Outbreaks.......................................................................6 Sentinel Provider Surveillance (Outpatients)..............................................................................................7 Laboratory Surveillance ..............................................................................................................................8 Weekly U.S. Influenza Surveillance Report................................................................................................10

Minnesota Influenza Surveillance (health.state.mn.us/diseases/flu/stats/) Weekly U.S. Influenza Surveillance Report (flu/weekly/) World Health Organization (WHO) Surveillance (who.int/teams/global-influenza-programme/ surveillance-and-monitoring/influenza-surveillance-outputs) Neighboring states' influenza information:

Iowa: Iowa Flu Reports (idph.influenza/reports) Wisconsin: Influenza (Flu) () North Dakota: Reported Seasonal Influenza Activity in North Dakota (default.aspx) South Dakota: South Dakota Influenza Information (doh.diseases/infectious/flu/)

Due to the COVID-19 pandemic, CDC and MDH will not be posting the weekly geographic spread indicators (no activity, sporadic, local, regional, widespread) this season as they rely on influenza-like illness data (ILI). Because these data are based on symptoms, the cause of ILI cannot reliably be attributed to influenza while COVID-19 is widely circulating.

Minnesota Department of Health 651-201-5414 or 1-877-676-5414 health.state.mn.us

Week

B (no genotype)

B (Yamagata)

B (Victoria)

A (not subtyped)

A H3

A H1 (unspecified)

A (H1N1)pdm09

A (H1N2v)

A (H3N2v)

A&B

Unknown

Season

2018-2019

2019-2020

2020-2021

2021-2022

40

2

Hospitalized

Influe40 nza

Surveillance 3.0

2.0

0.0

2.0

41

2

1

2

41

4.0

5.0

1.0

0.0

2022-2023 4.0 8.0

2023-2024 2.0 3.0

42

2

1

42

11.0

6.0

1.0

3.0

15.0

2.0

43

8.0

8.0

1.0

3.0

45.0

4.0

43

4

Hospitalized influenza cases are based on disease reports of laboratory-positive influenza (via DFA, IFA, viral culture, EIA, rapid test, paired serological tests

44

5.0

7.0

1.0

0.0

114.0

13.0

or44 RT-PCR) and specimens11from hospita2lized patients with acute respiratory illness submitted to MDH-PHL by hospitals and laboratories. Due to the need to

4c5 onfirm3 reports and repor2t4 ing de1 lays, c2onsider current week data preliminary. 45

7.0

12.0

2.0

2.0

268.0

30.0

46

2

24

1

46

2.0

22.0

3.0

2.0

320.0

27.0

47

1

48

2

49

5004

50

4506

Hospita1l8ized Influe5nza Cases by Type, 1 Mi48nnesota (F2luSurv-NET*)

61

8

7

1

124

9

18

47 48 49 50

600

51

7.0 Hospitali2z5.0ed Influen5z.0 a Cases by1.0 Season, 547.0

24.0

10.0

Mi51n.0 nesota (F1l.0uSurv-NET1*2.0 )

564.0

53.0

13.0

46.0

1.0

28.0

403.0

80.0

8.0

66.0

0.0

51.0

286.0

159.0

18.0

110.0

0.0

105.0

162.0

127.0

51

4004

52

5

350

1

300

2

119

1

3

212

4

3

52

50.0

500

1

52.0

2

55.0

400

3

51.0

194.0

2.0

247.0

2.0

184.0

1.0

203.0

4.0

129.0 98.0 53.0 35.0

187.0 96.0 51.0 35.0

225.0

3

250

4

99.0

237.0

0.0

23.0

21.0

4

200

5

300

138.0

228.0

5.0

21.0

19.0

Sum of Frequency Number of hospitalizaons

5

150

6

100

7

6

130.0

361.0

1.0

7

200

155.0

372.0

1.0

8

228.0

446.0

0.0

13.0

10.0

19.0

14.0

8.0

7.0

50

8

9

100

193.0

422.0

1.0

22.0

6.0

0

9

40 41 42 43 44 45 46 47 48 49 50 51 52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

10

MMWR Week

11 B (no genotype) B (Yamagata)

12 B (Victoria)

A (not subtyped) A H3 A (H1N1) pdm09

A (H1N2v) A (H3N2v) A & B

Unknown

13

Hospitalizations this week

14

225

15

Hospitalizations last week 222

Total hospitalizations (to date) 908

16

17

10

257.0

368.0

1.0

20.0

8.0

0

11

236.0

244.0

0.0

26.0

6.0

40 41 42 43 44 45 46 47 48 49 50 51 52 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

12

189.0

104.0

MMWR0.0Week

30.0

8.0

13

2018-2019 186.0

2019-2020 34.0 2020-2021 0.0 2021-2022

21.0 2022-2023

222.00 23-2024

14

136.0

8.0

1.0

14.0

18.0

15 Season

93.0

4.0Total hospitaliz0.0ations (historic25).0

19.0

16 2018-2019 51.0

3.02543

0.0

36.0

11.0

17 2019-2020 55.0

2.04022

0.0

35.0

14.0

18 2020-2021 28.0

35 0.0

0.0

34.0

19.0

19 2021-2022 28.0

905 1.0

0.0

21.0

18.0

18

20 2022-2023 16.0

0.03,338

0.0

7.0

13.0

19

*FluSurv-NET = Influenza Surveillance Network

2023-2024 (to date)

908

20

Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending Dec. 30, 2023 | WEEK 52

Page 2

Number of hospitalizaons Hospitalizaons per 100,000 persons

Number of hospitalizaons Incidence rate

Region Central Metro

Number of hospitalizations

136.0

Incidence (cases) per 100,000 persons

17.0

566.0

18.0

Age range

Number of hospitalizations

Incidence (cases) per 100,000 persons

Hospitalized

Influenza

Surveillance 0-4

57.0

17.3

(continued)

5-24

86.0

5.8

Number Northeast

28.0

of8.6

Influenza

Hospitalizations

and

Incidence

by

Region,

Northwest

20.0

12.7

Minnesota

25-49

Number of 148.0

8.1

Influenza

Hospitalizations

and

Incidence

by

Age,

50-64

190.0

17.6

Minnesota

South Central

42.0

14.1

700

Southeast

53.0

10.2

65+

427.0

42.8

70

700

70

Southwest

23.0

10.5

600

60

600

60

West Central

40.0

16.0

500

50

500

50

42.8

400

40

400

40

300

30

300

30

200 17.0

100

0 Central

18.0 Metro

Number of hospitalizaons

8.6 Northeast

12.7

14.1

10.2

Northwest South Central Southeast

16.0 20

10.5

10

0 Southwest West Central

Region Incidence (cases) per 100,000 persons

200

17.3

100

0 0-4

Number of hospitalizaons

17.6

8.1 5.8

5-24

25-49

50-64

Age group (years)

Incidence (cases) per 100,000 persons

20

10

0 65+

Region Central

Hospitalizations Total

this week

(to date)

30

136

% Hospitalizations this week

13%

% Total (to date)

15%

Median age (years) at time of admission 63

Metro

144

566

64%

62%

Northeast

11

28

5%

3%

Northwest

8

20

4%

2%

South Central 8

42

4%

5%

Southeast

12

53

5%

6%

Southwest

6

23

3%

3%

West Central 6

40

3%

4%

Minnesota Department of Health Weekly Influenza & Respiratory Activity Report for Week Ending Dec. 30, 2023 | WEEK 52

Page 3

Season 40 41

2023-2024 0.00 1.00

2022-2023

2021-2022

2020-2021

2019-2020

2018-2019

Age Group

2018-2019

2019-2020

2020-2021

2021-2022

2022-2023

2023-2024

Influenza-Associated Death Surveillance 1.00

1.00

0.00

0.00

1.00

0-17

1

3

0

2

0

0

0.00

0.00

0.00

0.00

0.00

18-49

9

15

2

5

1

2

42

0.00

0.00

0.00

0.00

0.00

0.00

50-64

16

31

1

6

0

4

43

0.00

0.00

1.00

0.00

1.00

0.00

65-79

33

51

1

18

0

6

Influenza deaths are collected via reports from Minnesota's death certificate database, hospitals, and long-term care facilities. Decedents with influenza listed

44

0.00

3.00

0.00

0.00

0.00

0.00

80+

36

53

3

23

0

10

as a cause of or contributor to death, have recent laboratory confirmation of influenza, or are part of an ongoing influenza outbreak at a long-term care facility

a45 re rep0.00orted to influenza3.00 surveillanc0.e00 . Due to the1.00 need to co0.00nfirm repor0.0t0 s and reporting delays, consider current week data preliminary.

46

0.00

6.00

0.00

0.00

1.00

0.00

47

0.00

Deaths As15s.00ociated with 1.00 Influe0n.00 za by Sea0.0s0 on,

0.00

48

1.00

19.00

Minnesota 0.00

0.00

1.00

1.00

49

3.00

27.00

2.00

0.00

1.00

1.00

50

50

3.00

35.00

2.00

0.00

4.00

0.00

51

45 2.00

25.00

2.00

0.00

3.00

3.00

52

40 5.00

1

35

2

3

30

20.00

6.00

0.00

3.00

3.00

14.00

6.00

3.00

10.00

2.00

15.00

3.00

1.00

11.00

1.00

11.00

9.00

0.00

4.00

3.00

Number of deaths

4

25

5

20

6

15

7

8

10

6.00

1.00

1.00

8.00

3.00

4.00

5.00

1.00

8.00

4.00

6.00

3.00

0.00

9.00

6.00

0.00

3.00

0.00

12.00

8.00

3.00

0.00

0.00

15.00

8.00

9

5

1.00

0.00

0.00

23.00

3.00

10

1.00

0.00

0.00

20.00

18.00

0

11

40 41 42 43 44 45 46 47 480.00 49 50 51 52 1 2 1.00 3 4 5 6 7 8 0.00 9 10 11 12 13 21.00 14 15 16 17 1815.1009 20

12

0.00

MM0.00 WR Week

0.00

15.00

14.00

13

2023-2024

2022-20231.00

2021-20221.00

2020-2021 0.00

2019-2020 13.00

2018-2019 5.00

Number of deaths

Deaths Associated with Influenza by Age Group and Season,

Minnesota

0-17

18-49

50-64

65-79

80+

120

100

80

60

40

20 0

2018-2019

2019-2020

Top: Age group (years) Boom: Season

2020-2021

2021-2022

2022-2023

2023-2024

2018-2019 2019-2020 2020-2021 2021-2022 2022-2023 2023-2024 2018-2019 2019-2020 2020-2021 2021-2022 2022-2023 2023-2024 2018-2019 2019-2020 2020-2021 2021-2022 2022-2023 2023-2024 2018-2019 2019-2020 2020-2021 2021-2022 2022-2023 2023-2024 2018-2019 2019-2020 2020-2021 2021-2022 2022-2023 2023-2024

14

2.00

1.00

Season

15

Total deaths

2.00

3.00

2018-2019

126

16

0.00

1.00

2019-2020

197

17

2.00

1.00

2020-2021

7

18

0.00

0.00

2021-2022

71

19

0.00

1.00

2022-2023

224

20

2.00

0.00

2023-2024 (to date) 22

*FluSurv-NET = Influenza Surveillance Network

0.00

4.00

8.00

Total pediatric ( ................
................

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