Statistics

Detection of influenza viruses in respiratory specimens in 2025

Week number	Date	No. of specimen tested	Type A								Type B			Type C
Week number	Date	No. of specimen tested	Positive	%	Subtyping performed	H1	H3	H5	H7	H9	Positive	%	Lineage determination performed*	No.	%
1	29/12/2024 - 04/01	8424	398	4.72	381	354	27	0	0	0	13	0.15	12	1	0.01
2	05/01 - 11/01	8864	571	6.44	542	509	33	0	0	0	13	0.15	13	0	0.00
3	12/01 - 18/01	9016	699	7.75	665	617	48	0	0	0	19	0.21	19	2	0.02
4	19/01 - 25/01	9353	900	9.62	841	764	77	0	0	0	14	0.15	14	3	0.03
5	26/01 - 01/02	7715	660	8.55	592	545	48	0	0	0	9	0.12	9	1	0.01
6	02/02 - 08/02	10016	918	9.17	837	758	79	0	0	0	29	0.29	29	1	0.01
7	09/02 - 15/02	9196	689	7.49	625	574	51	0	0	0	32	0.35	30	5	0.05
8	16/02 - 22/02	8794	537	6.11	476	450	26	0	0	0	23	0.26	23	1	0.01
9	23/02 - 01/03	8100	367	4.53	329	311	18	0	0	0	45	0.56	43	2	0.02
10	02/03 - 08/03	8236	222	2.70	202	193	9	0	0	0	44	0.53	39	2	0.02
11	09/03 - 15/03	8146	154	1.89	135	124	11	0	0	0	35	0.43	35	2	0.02
12	16/03 - 22/03	7782	107	1.37	93	83	10	0	0	0	46	0.59	46	2	0.03
13	23/03 - 29/03	8620	83	0.96	78	69	9	0	0	0	39	0.45	39	0	0.00
14	30/03 - 05/04	7420	54	0.73	49	40	9	0	0	0	39	0.53	39	0	0.00
15	06/04 - 12/04	8648	41	0.47	33	25	8	0	0	0	32	0.37	32	1	0.01
16	13/04 - 19/04	8507	33	0.39	33	29	4	0	0	0	33	0.39	33	1	0.01
17	20/04 - 26/04	8879	23	0.26	22	18	4	0	0	0	27	0.30	27	0	0.00
18	27/04 - 03/05	8468	35	0.41	30	19	11	0	0	0	26	0.31	25	0	0.00

* All belonged to B/Victoria lineage.

Remarks:

1. For specimens received from 10 February 2014 onwards, molecular testing has replaced viral culture. Please interpret the data and trends in light of the enhanced sensitivity of molecular testing, and hence positive detection rates.

2. Figures are subject to minor adjustments.

3. Multiple specimens may have been received for testing from the same patient.
4. As a result of disruptions in laboratory testing from early 2020 to early 2023, please interpret the data with caution.

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