Influenza surveillance results in Ordos City in 2017 - 2023
10.3969/j.issn.1006-2483.2026.02.012
- VernacularTitle:2017—2023年鄂尔多斯市流感监测结果分析
- Author:
Xiaomin ZHANG
1
;
Hongtao XIAO
2
;
Sheng WANG
2
;
Rong SUN
2
;
Shangwu JIN
2
;
Di ZHANG
2
;
Jiming HAO
2
;
Jialin LYU
2
;
Chunyan YANG
2
Author Information
1. School of Public Health, Inner Mongolia Medical University, Hohhot, Inner Mongolia 010000, China
2. Ordos Center for Disease Control and Prevention, Ordos, Inner Mongolia 017000, China
- Publication Type:Journal Article
- Keywords:
Influenza;
Pathogen surveillance;
Epidemiological analysis
- From:
Journal of Public Health and Preventive Medicine
2026;37(2):54-58
- CountryChina
- Language:Chinese
-
Abstract:
Objective To analyze the influenza-like illness (ILI) data in Ordos City from 2017 to 2023 and conduct nucleic acid detection of the virus to understand the local influenza epidemic situation, and to provide a reliable basis for influenza prevention and control in the city. Methods Real-time quantitative polymerase chain reaction (qPCR) was used to identify virus subtypes in ILI throat swab samples. Comparisons of positive rates were conducted using the chi-square test, with a significance level of α=0.05. Results From 2017 to 2023, a total of 3,283,434 outpatient and emergency visits were recorded at the Ordos City Central Hospital, including 74,159 ILI cases, with an ILI proportion of 2.26%. The majority of ILI cases (74.43%) occurred in children aged 0~14 years old. The overall positive rate of influenza virus nucleic acid detection was 10.87%, with the highest proportion being subtype A (seasonal H3) at 43.03%. The highest detection rate was observed in the 5~14 years age group, with statistically significant differences in positive rates across age groups (χ2=155.638, P<0.001). Influenza peaks occurred mainly from November to March of the following year. From January to April, three types of influenza were prevalent alternately or mixed, while from October to December, subtype A (seasonal H3) predominated. Positive rates varied significantly across months (χ2=250.923, P<0.001). The temporal trends of ILI proportions and PCR-positive rates were consistent. Conclusion Influenza in Ordos City exhibits distinct seasonal and age distribution characteristics, with alternating or mixed circulation of three virus types. Continued efforts are needed to strengthen influenza surveillance, especially the prevention and control of influenza in infants and adolescents.
