Table 2.
Distribution of influenza viruses by year of detection.
| Pathogen | Surveillance year |
||||||
|---|---|---|---|---|---|---|---|
| Total | 2012 | 2013 | 2014 | 2015 | 2016 | 2017 | |
| n = 33,404 | n = 1846 | n = 2081 | n = 2901 | n = 5953 | n = 5670 | n = 14,953 | |
| Positive cases |
|||||||
| No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | No. (%) | |
| Influenza viruses | 6162 (18.4) | 210 (11.4) | 123 (5.9) | 320 (11) | 1267 (21.3) | 835 (14.7) | 3407 (22.8) |
| Influenza A | 4642 (13.9) | 147 (7.9) | 96 (4.6) | 264 (9.1) | 1145 (19.2) | 354 (6.2) | 2636 (17.6) |
| A/H1N1 | 3236 (9.7) | 85 (0.3) | 33 (0.1) | 188 (0.6) | 967 (2.9) | 75 (0.22) | 1888 (5.7) |
| A/H3N2 | 315 (0.9) | a | a | a | a | a | 315 (0.9) |
| Influenza B | 1520 (4.6) | 63 (3.4) | 27 (1.3) | 56 (1.9) | 122 (2) | 481 (8.5) | 771 (5.2) |
a
Samples were not tested for influenza A/H3N2.