Influenza Cases Data - 2025-2026 Season for New Castle County

Influenza Positive Cases

Showing data for

Data are current as of 11/22/2025

Most recent dashboard update: 11/30/2025

Key Case Indicators

New Castle County

New Flu Cases

Week 47 (11/16/2025 - 11/22/2025)

cases

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New Castle County

Total Flu Cases

Week 40 to 47 (9/28/2025 - 11/22/2025)

cases

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Cumulative Flu Cases

Total Flu Cases for New Castle County

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Total Flu Cases by County (Cumulative)

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New Cases (Current Season)

New Flu Cases for New Castle County

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Confirmed Flu Cases (State and County)

Influenza Cases are confirmed via PCR testing

2025 - 2026Influenza Season (Current)¹

Location	Week 47 11/23/2026 - 11/29/2026	Year to Date2
Delaware	58	170
New Castle County	34	90
Kent County	9	30
Sussex County	15	50

2024 - 2025Influenza Season

Location	Week 47 11/16/2025 - 11/22/2025	Year to Date2
Delaware	47	108
New Castle County	20	46
Kent County	21	42
Sussex County	6	20

2023 - 2024Influenza Season

Location	Week 47 11/17/2024 - 11/23/2024	Year to Date2
Delaware	66	237
New Castle County	50	140
Kent County	9	55
Sussex County	7	42

2022 - 2023Influenza Season

Location	Week 47 11/19/2023 - 11/25/2023	Year to Date2
Delaware	1,042	3,151
New Castle County	502	1,558
Kent County	311	667
Sussex County	229	926

Footnotes:
1. There may be technical discrepancies of reporting numbers week to week due to retroactive reporting or reclassification of cases.
2. YTD stands for “Year to Date” and represents the cumulative number of cases through the current MMWR Week being assessed for the current flu season.
3. Percentage of cases for the cumulative count of confirmed cases through the influenza season to the current MMWR Week.

Confirmed Flu Cases by Age Group (New Castle County)

Cell counts with less than 10 cases are suppressed for smaller age groups.

2025 - 2026Influenza Season (Current)¹

Age	Week 47 11/23/2026 - 11/29/2026	Year to Date2
0 - 4	7	21
5 - 11	3	10
12 - 17	7	12
18 - 34	3	12
35 - 49	2	9
50 - 64	5	11
65+	9	15

2024 - 2025Influenza Season

Age	Week 47 11/16/2025 - 11/22/2025	Year to Date2
0 - 4	5	9
5 - 11	6	14
12 - 17	1	2
18 - 34	3	7
35 - 49	1	3
50 - 64	4	5
65+	1	5

2023 - 2024Influenza Season

Age	Week 47 11/17/2024 - 11/23/2024	Year to Date2
0 - 4	5	24
5 - 11	10	28
12 - 17	5	8
18 - 34	6	20
35 - 49	4	10
50 - 64	11	27
65+	5	15

2022 - 2023Influenza Season

Age	Week 47 11/19/2023 - 11/25/2023	Year to Date2
0 - 4	89	298
5 - 11	101	444
12 - 17	40	188
18 - 34	111	278
35 - 49	27	80
50 - 64	44	109
65+	67	111

Sections in Influenza Dashboard

Overview Cases Hospitalizations Vaccinations

Location

Week 47

11/23/2026 - 11/29/2026

Year to Date2

Delaware

170

New Castle County

Kent County

Sussex County

Location

Week 47

11/16/2025 - 11/22/2025

Year to Date2

Delaware

108

New Castle County

Kent County

Sussex County

Location

Week 47

11/17/2024 - 11/23/2024

Year to Date2

Delaware

237

New Castle County

140

Kent County

Sussex County

Location

Week 47

11/19/2023 - 11/25/2023

Year to Date2

Delaware

1,042

3,151

New Castle County

502

1,558

Kent County

311

667

Sussex County

229

926

Age

Week 47

11/23/2026 - 11/29/2026

Year to Date2

0 - 4

5 - 11

12 - 17

18 - 34

35 - 49

50 - 64

65+

Age

Week 47

11/16/2025 - 11/22/2025

Year to Date2

0 - 4

5 - 11

12 - 17

18 - 34

35 - 49

50 - 64

65+

Age

Week 47

11/17/2024 - 11/23/2024

Year to Date2

0 - 4

5 - 11

12 - 17

18 - 34

35 - 49

50 - 64

65+

Age

Week 47

11/19/2023 - 11/25/2023

Year to Date2

0 - 4

298

5 - 11

101

444

12 - 17

188

18 - 34

111

278

35 - 49

50 - 64

109

65+

111