Influenza in the U.S. by subtype and week 2023 | Statista

The number of new cases of influenza in the United States is highest at the beginning of the year and at the end of the year. This statistic shows the number of specimens which tested positive for influenza in the United States in 2023, by week and by subtype or lineage.

Number of specimens testing positive for influenza in the United States in 2023, by week and subtype/lineage

Characteristic	A (H1N1)	A (H3)	A (Not subtyped)	B (Victoria)	B (Yamagata)	B (Not determined)
52	1,190	292	280	229	0	21
51	1,209	321	314	267	0	34
50	991	280	424	292	0	81
49	968	271	244	261	0	52
48	706	176	173	219	0	24
47	579	124	139	140	0	27
46	486	103	149	142	0	43
45	479	61	115	130	0	32
44	290	41	64	89	0	14
43	239	36	49	68	0	14
42	276	26	34	73	0	11
41	212	22	13	68	0	5
40	176	16	10	48	0	3
39	122	10	7	24	0	6
38	91	10	6	35	0	1
37	59	15	8	22	0	1
36	65	8	19	22	0	6
35	58	10	9	12	0	3
34	57	9	3	24	0	9
33	53	13	7	21	0	1
32	45	5	9	32	0	3
31	73	6	6	25	0	1
30	48	5	1	29	0	1
29	62	7	1	16	0	2
28	58	4	5	26	0	1
27	61	1	4	33	0	4
26	63	17	5	54	0	3
25	68	5	4	36	0	5
24	62	3	7	42	0	7
23	67	5	3	58	0	13
22	56	1	5	39	0	11
21	41	3	5	43	0	14
20	45	10	3	59	0	10
19	50	4	2	68	0	8
18	41	9	2	54	0	11
17	42	18	2	49	0	11
16	33	12	2	46	0	17
15	47	6	9	37	0	11
14	65	19	11	37	0	14
13	57	17	16	41	0	10
12	60	38	11	34	0	15
11	59	28	8	25	0	9
10	75	44	14	21	0	10
9	75	53	13	28	0	8
8	61	60	17	14	0	4
7	85	69	18	26	0	3
6	131	115	25	21	0	6
5	121	118	24	18	0	2
4	123	165	40	10	0	0
3	210	324	66	12	0	4
2	223	527	96	13	0	1
1	398	822	227	12	0	2

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Release date

April 2024

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Region

United States

Survey time period

2023

Supplementary notes

Data was obtained from sentinel surveillance systems.
Release date is date figures were accessed.

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