Table 2.
Comparison of IgM positive detection rate of a single pathogen and of multiple pathogens across different years and seasons (n, %)
| Classification | Case number | IgM positive detection rates of a single pathogen | IgM positive detection rates of two or more pathogens |
|---|---|---|---|
| Year | |||
| 2019 | 5272 | 1953 (37.04) | 219 (4.15) |
| 2020 | 4122 | 851 (20.65) | 30 (0.73) |
| 2021 | 5491 | 995 (18.12) | 23 (0.42) |
| 2022 | 4988 | 1241 (24.88) | 9 (0.18) |
| 2023 | 5820 | 2452 (42.13) | 1 (0.02) |
| χ2 | 1145.535 | 583.429 | |
| P | < 0.001 | < 0.001 | |
| Season | |||
| Spring | 6540 | 1692 (25.87) | 87 (1.33) |
| Summer | 6362 | 1710 (26.88) | 91 (1.43) |
| Autumn | 6426 | 2173 (33.82) | 59 (0.92) |
| Winter | 6365 | 1917 (30.12) | 45 (0.71) |
| χ2 | 120.994 | 20.60 | |
| P | < 0.001 | < 0.001 |
Note: From March to May was defined as Spring, June to August as Summer, September to November as Autumn, and December to February as Winder in accordance with meteorological changes.