Detection of influenza viruses in respiratory specimens in 2024

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	No.	%	No.	%
1	31/12/2023 - 06/01	7106	610	8.58	596	45	551	0	0	0	80	1.13	3	0.04
2	07/01 - 13/01	7401	544	7.35	519	44	475	0	0	0	85	1.15	10	0.14
3	14/01 - 20/01	6736	331	4.91	317	35	282	0	0	0	52	0.77	3	0.04
4	21/01 - 27/01	6584	219	3.33	201	18	183	0	0	0	44	0.67	6	0.09
5	28/01 - 03/02	7127	213	2.99	202	22	180	0	0	0	54	0.76	7	0.10
6	04/02 - 10/02	6478	248	3.83	238	27	211	0	0	0	88	1.36	1	0.02
7	11/02 - 17/02	7960	351	4.41	340	89	251	0	0	0	91	1.14	3	0.04
8	18/02 - 24/02	8766	370	4.22	352	140	211	0	0	1	107	1.22	5	0.06
9	25/02 - 02/03	7842	329	4.20	301	132	169	0	0	0	87	1.11	6	0.08
10	03/03 - 09/03	8436	316	3.75	300	148	153	0	0	0	77	0.91	5	0.06
11	10/03 - 16/03	8416	416	4.94	390	207	183	0	0	0	58	0.69	2	0.02
12	17/03 - 23/03	8834	389	4.40	355	227	128	0	0	0	53	0.60	2	0.02
13	24/03 - 30/03	7999	359	4.49	332	252	80	0	0	0	50	0.63	3	0.04
14	31/03 - 06/04	7983	390	4.89	369	273	96	0	0	0	31	0.39	1	0.01
15	07/04 - 13/04	7652	552	7.21	514	422	92	0	0	0	28	0.37	2	0.03
16	14/4 - 20/4	8095	653	8.07	600	528	73	0	0	0	25	0.31	2	0.02

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.