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Detection of influenza viruses in respiratory specimens in 2020

Detection of influenza viruses in respiratory specimens in 2020

Week
number

Date

Age

No. of specimen tested

Type A subtype H1

Type A subtype H3

Type A subtype H5

Type A subtype H7

Type A subtype H9

Type B

Type C

No.

%

No.

%

No.

%

No.

%

No.

%

No.

%

No.

%

1 29/12/2019 - 04/01 All ages 5711 389 6.81 184 3.22 0 0.00 0 0.00 0 0.00 18 0.32 17 0.30
2 05/01 - 11/01 All ages 6893 871 12.64 307 4.45 0 0.00 0 0.00 0 0.00 33 0.48 5 -
3 12/01 - 18/01 All ages 6342 928 14.63 189 2.98 0 0.00 0 0.00 0 0.00 42 0.66 5 -
4 19/01 - 25/01 All ages 6294 984 15.63 150 2.38 0 0.00 0 0.00 0 0.00 47 0.75 5 -
5 26/01 - 01/02 All ages 7076 846 11.96 116 1.64 0 0.00 0 0.00 0 0.00 41 0.58 12 -
6 02/02 - 08/02 All ages 5650 266 4.71 33 0.58 0 0.00 0 0.00 1 0.02 21 0.37 5 -
7 09/02 - 15/02 All ages 4965 75 1.51 12 0.24 0 0.00 0 0.00 0 0.00 6 0.12 10 -
8 16/02 - 22/02 All ages 5664 15 0.26 5 0.09 - - - - - - 3 0.05 - -
9 23/02 - 29/02 All ages 4966 11 0.22 3 0.06 - - - - - - 4 0.08 - -
10 01/03 - 07/03 All ages 4212 6 0.14 0 0.00 - - - - - - 1 0.02 - -
11 08/03 - 14/03 All ages 4461 3 0.07 5 0.11 - - - - - - 9 0.20 - -
12 15/03 - 21/03 All ages 5615 5 0.09 5 0.09 - - - - - - 15 0.27 - -
13 22/03 - 28/03 All ages 4299 2 0.05 1 0.02 - - - - - - 4 0.09 - -
14 29/03 - 04/04 All ages 2343 2 0.09 0 0.00 - - - - - - 2 0.09 - -
15 05/04 - 11/04 All ages 2210 0 0.00 0 0.00 - - - - - - 1 0.05 - -
16 12/04 - 18/04  All ages 2091 0 0.00 0 0.00 - - - - - - 0 0.00 - -
17 19/04 - 25/04  All ages 2042 0 0.00 0 0.00 - - - - - - 0 0.00 - -
18 26/04 - 02/05 All ages 1903 0 0.00 0 0.00 - - - - - - 0 0.00 - -
19 03/05 - 09/05 All ages 1958 0 0.00 0 0.00 - - - - - - 0 0.00 - -
20 10/05 - 16/05 All ages 1926 0 0.00 0 0.00 - - - - - - 0 0.00 - -
21 17/05 - 23/05 All ages 1956 0 0.00 0 0.00 - - - - - - 0 0.00 - -
22 24/05 - 30/05 All ages 1869 0 0.00 1 0.05 - - - - - - 0 0.00 - -
23 31/05 - 06/06 All ages 2230 0 0.00 0 0.00 - - - - - - 0 0.00 - -
24 07/06 - 13/06 All ages 2101 0 0.00 0 0.00 - - - - - - 0 0.00 - -
25 14/06 - 20/06 All ages 2118 0 0.00 0 0.00 - - - - - - 0 0.00 - -
26 21/06 - 27/06 All ages 2083 0 0.00 0 0.00 - - - - - - 0 0.00 - -
27 28/06 - 04/07 All ages 2057 0 0.00 0 0.00 - - - - - - 0 0.00 - -
28 05/07 - 11/07 All ages 2556 0 0.00 0 0.00 - - - - - - 0 0.00 - -
29 12/07 - 18/07 All ages 2766 0 0.00 0 0.00 - - - - - - 0 0.00 - -
30 19/07 - 25/07 All ages 2402 0 0.00 0 0.00 - - - - - - 0 0.00 - -
31 26/07 - 01/08 All ages 2158 0 0.00 0 0.00 - - - - - - 0 0.00 - -
32 02/08 - 08/08 All ages 1800 0 0.00 0 0.00 - - - - - - 0 0.00 - -
33 09/08 - 15/08 All ages 1698 0 0.00 0 0.00 - - - - - - 0 0.00 - -
34 16/08 - 22/08 All ages 1593 0 0.00 0 0.00 - - - - - - 0 0.00 - -
35 23/08 - 29/08 All ages 1616 0 0.00 0 0.00 - - - - - - 0 0.00 - -
36 30/08 - 05/09 All ages 1568 0 0.00 0 0.00 - - - - - - 0 0.00 - -
37 06/09 - 12/09 All ages 1514 0 0.00 0 0.00 - - - - - - 0 0.00 - -
38 13/09 - 19/09 All ages 1484 0 0.00 0 0.00 - - - - - - 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. From 8 January 2020 to 18 February 2020, influenza virus type C data are only collected from adults >= 18 years, and starting from 19 February 2020, only influenza virus types A, B and RSV data are available during the COVID-19 outbreak.