Volume 26, Number 11—November 2020
Research Letter
Abrupt Subsidence of Seasonal Influenza after COVID-19 Outbreak, Hong Kong, China
Ngai-Sze Wong, Chi-Chiu Leung, and Shui-Shan Lee
Table
Characteristics of winter influenza seasons, Hong Kong, China, 2013–14 through 2019–20*
| Seasonal year | Onset week | Duration, weeks | Peak level, % | Postseason trough, % | Peak to trough, wk | Weekly no. tests, median (IQR) |
|---|---|---|---|---|---|---|
| 2013–14 | 49 | 22 | 31.4 | 4.3 | 13 | 2,423 (2,191–2,588) |
| 2014–15 | 49 | 21 | 38.6 | 6.1 | 15 | 3,640 (3,029–4,230) |
| 2015–16 | 51 | 25 | 25.7 | 2.5 | 17 | 4,017 (3,292–4,537) |
| 2016–17 | 52 | 14 | 9.2 | 5.5 | 6 | 4.104 (3,890–4,216) |
| 2017–18 | 47 | 30 | 26.5 | 0.8 | 20 | 4,426 (4,100–6,335) |
| 2018–19 | 47 | 23 | 29.9 | 4.4 | 14 | 6,073 (5,439–6,475) |
| 2019–20 | 48 | 13 | 18.8 | 0.4 | 6 | 5,711 (5,327–6,318) |
*IQR, interquartile range.
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