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To analyze the results of influenza sentinel surveillance in Sichuan Province from 2020 to 2022, to provide basis for influenza prevention and control in Sichuan.
The surveillance data of influenza-like illness (ILI) reported by 30 national influenza surveillance sentinel hospitals in Sichuan Province were collected through China Influenza Surveillance Information System, and the results of influenza sentinel surveillance in Sichuan Province from 2020 to 2022 were analyzed retrospectively by descriptive epidemiological methods.
From 2020 to 2022, there was a correlation between the proportion of ILI to the total number of outpatient and emergency surveillance cases (ILI%) and the detection rate of influenza in ILI samples (rs=0.626, P < 0.001). From 2020 to 2022, a total of 103 544 influenza samples were collected and tested in Sichuan Province, of which 8 798 were tested positive, with a positive rate of 8.50%. In 2020, the epidemic level of influenza in Sichuan Province was low, and the epidemic peak was in January, which was co-epidemic of subtype A (H3N2) and strain B (Victoria). In 2021, the epidemic peak was in autumn and winter, and the dominant strain was strain B (Victoria). In 2022, there was an obvious summer epidemic peak in Sichuan Province, and the dominant strain was subtype A (H3N2). There were significant differences in the positive rate of ILI among different years, age groups, and cities and states (P<0.001).
Influenza B (Yamagata) was not detected in Sichuan Province from 2020 to 2022, and the main epidemic strain were A(H3N2) and B(Victoria). The epidemic strains in Sichuan Province displayed decreased epidemic levels at the end of 2020 and 2022, which may be attributed to the COVID-19 preventive and control efforts and the occurrence of viral interference. It is necessary to continue influenza surveillance and strengthen the prevention and control of influenza in children and students.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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