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Concentration ratio (CR) of influenza activity, Guangdong
| Item | 2017–2018 | 2018–2019 | 2019–2020 | 2020–2021 |
|---|---|---|---|---|
| 0.39 | 0.07 | 0.83 | − 0.58 | |
| − 0.41 | − 0.31 | − 0.17 | − 0.05 | |
| 0.57a | 0.32 b | 0.85c | 0.58a |
a, b and c denote moderate, low and high concentration, respectively
