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	14/04 - 20/04	8096	654	8.08	601	528	73	0	0	0	25	0.31	2	0.02
17	21/04 - 27/04	8657	831	9.60	788	693	95	0	0	0	33	0.38	3	0.03
18	28/04 - 04/05	9217	1251	13.57	1171	1076	96	0	0	0	26	0.28	2	0.02
19	05/05 - 11/05	8935	1264	14.15	1154	1074	80	0	0	0	24	0.27	2	0.02
20	12/05 - 18/05	8667	1023	11.80	933	872	61	0	0	0	12	0.14	0	0.00
21	19/05 - 25/05	8277	667	8.06	597	546	51	0	0	0	17	0.21	0	0.00
22	26/05 - 01/06	8063	508	6.30	462	413	49	0	0	0	5	0.06	2	0.02
23	02/06 - 08/06	7278	410	5.63	378	354	24	0	0	0	2	0.03	0	0.00
24	09/06 - 15/06	7323	354	4.83	326	302	24	0	0	0	5	0.07	1	0.01
25	16/06 - 22/06	7747	398	5.14	362	343	19	0	0	0	10	0.13	0	0.00
26	23/06 - 29/06	8400	516	6.14	466	428	38	0	0	0	9	0.11	0	0.00
27	30/06 - 06/07	7734	483	6.25	457	422	35	0	0	0	7	0.09	1	0.01
28	07/07 - 13/07	7929	466	5.88	446	399	47	0	0	0	3	0.04	1	0.01
29	14/07 - 20/07	7508	370	4.93	359	316	43	0	0	0	0	0.00	2	0.03
30	21/07 - 27/07	8128	366	4.50	353	300	53	0	0	0	7	0.09	0	0.00
31	28/07 - 03/08	7711	272	3.53	253	212	41	0	0	0	4	0.05	0	0.00
32	04/08 - 10/08	8051	192	2.38	178	125	53	0	0	0	10	0.12	0	0.00
33	11/08 - 17/08	7303	124	1.70	118	87	31	0	0	0	7	0.10	1	0.01
34	18/08 - 24/08	7208	117	1.62	111	84	27	0	0	0	2	0.03	0	0.00
35	25/08 - 31/08	7458	109	1.46	100	76	24	0	0	0	5	0.07	0	0.00
36	01/09 - 07/09	7061	106	1.50	104	80	24	0	0	0	4	0.06	5	0.07
37	08/09 - 14/09	6882	84	1.22	82	67	15	0	0	0	3	0.04	0	0.00
38	15/09 - 21/09	6890	73	1.06	72	63	9	0	0	0	4	0.06	0	0.00
39	22/09 - 28/09	6992	67	0.96	63	49	14	0	0	0	7	0.10	0	0.00
40	29/09 - 05/10	6707	62	0.92	59	47	12	0	0	0	11	0.16	0	0.00
41	06/10 - 12/10	6448	39	0.60	38	35	3	0	0	0	5	0.08	0	0.00
42	13/10 - 19/10	6836	23	0.34	22	22	0	0	0	0	8	0.12	0	0.00
43	20/10 - 26/10	6430	22	0.34	20	15	5	0	0	0	3	0.05	0	0.00
44	27/10 - 02/11	6688	30	0.45	30	28	2	0	0	0	3	0.04	0	0.00
45	03/11 - 09/11	6674	31	0.46	26	22	5	0	0	0	6	0.09	2	0.03
46	10/11 - 16/11	7007	31	0.44	28	26	2	0	0	0	4	0.06	0	0.00

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.