Influenza Cases Data - 2025-2026 Season for Delaware

Influenza Positive Cases

Showing data for

Data are current as of 12/13/2025

Most recent dashboard update: 12/19/2025

Key Case Indicators

Delaware

New Flu Cases

Week 50 (12/7/2025 - 12/13/2025)

334

cases

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Delaware

Total Flu Cases

Week 40 to 50 (9/28/2025 - 12/13/2025)

770

cases

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Cumulative Flu Cases

Total Flu Cases for Delaware

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Total Flu Cases by County (Cumulative)

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New Cases (Current Season)

New Flu Cases for Delaware

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Confirmed Flu Cases (State and County)

Influenza Cases are confirmed via PCR testing

2025 - 2026Influenza Season (Current)¹

Location	Week 50 12/14/2026 - 12/20/2026	Year to Date2
Delaware	334	770
New Castle County	187	385
Kent County	67	159
Sussex County	79	217

2024 - 2025Influenza Season

Location	Week 50 12/7/2025 - 12/13/2025	Year to Date2
Delaware	162	397
New Castle County	86	189
Kent County	50	142
Sussex County	26	66

2023 - 2024Influenza Season

Location	Week 50 12/8/2024 - 12/14/2024	Year to Date2
Delaware	396	1,016
New Castle County	182	499
Kent County	106	275
Sussex County	108	242

2022 - 2023Influenza Season

Location	Week 50 12/10/2023 - 12/16/2023	Year to Date2
Delaware	1,114	6,897
New Castle County	494	3,155
Kent County	339	1,791
Sussex County	281	1,952

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 (Delaware)

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

2025 - 2026Influenza Season (Current)¹

Age	Week 50 12/14/2026 - 12/20/2026	Year to Date2
0 - 4	66	148
5 - 11	96	181
12 - 17	42	84
18 - 34	54	129
35 - 49	16	51
50 - 64	22	64
65+	38	113

2024 - 2025Influenza Season

Age	Week 50 12/7/2025 - 12/13/2025	Year to Date2
0 - 4	40	77
5 - 11	27	78
12 - 17	17	31
18 - 34	26	60
35 - 49	20	61
50 - 64	14	41
65+	18	49

2023 - 2024Influenza Season

Age	Week 50 12/8/2024 - 12/14/2024	Year to Date2
0 - 4	54	144
5 - 11	83	180
12 - 17	35	78
18 - 34	56	152
35 - 49	60	153
50 - 64	52	157
65+	56	152

2022 - 2023Influenza Season

Age	Week 50 12/10/2023 - 12/16/2023	Year to Date2
0 - 4	173	1,163
5 - 11	290	1,801
12 - 17	148	859
18 - 34	191	1,175
35 - 49	90	601
50 - 64	102	607
65+	120	691

Confirmed Cases of Influenza by Type and Subtype/Lineage

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Sections in Influenza Dashboard

Overview Cases Hospitalizations Vaccinations

Location

Week 50

12/14/2026 - 12/20/2026

Year to Date2

Delaware

334

770

New Castle County

187

385

Kent County

159

Sussex County

217

Location

Week 50

12/7/2025 - 12/13/2025

Year to Date2

Delaware

162

397

New Castle County

189

Kent County

142

Sussex County

Location

Week 50

12/8/2024 - 12/14/2024

Year to Date2

Delaware

396

1,016

New Castle County

182

499

Kent County

106

275

Sussex County

108

242

Location

Week 50

12/10/2023 - 12/16/2023

Year to Date2

Delaware

1,114

6,897

New Castle County

494

3,155

Kent County

339

1,791

Sussex County

281

1,952

Age

Week 50

12/14/2026 - 12/20/2026

Year to Date2

0 - 4

148

5 - 11

181

12 - 17

18 - 34

129

35 - 49

50 - 64

65+

113

Age

Week 50

12/7/2025 - 12/13/2025

Year to Date2

0 - 4

5 - 11

12 - 17

18 - 34

35 - 49

50 - 64

65+

Age

Week 50

12/8/2024 - 12/14/2024

Year to Date2

0 - 4

144

5 - 11

180

12 - 17

18 - 34

152

35 - 49

153

50 - 64

157

65+

152

Age

Week 50

12/10/2023 - 12/16/2023

Year to Date2

0 - 4

173

1,163

5 - 11

290

1,801

12 - 17

148

859

18 - 34

191

1,175

35 - 49

601

50 - 64

102

607

65+

120

691