CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES >

2025 , Vol. 43 >Issue 5: 723 - 726

DOI: https://doi.org/10.12140/j.issn.1000-7423.2025.05.019

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Epidemiological characteristics of scrub typhus in Changning County, Yunnan Province from 2014 to 2023

  • TIAN Yuxiu ,
  • HUANG Dongsheng
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  • 1 Changning County Center for Disease Control and Prevention, Changning 678100, Yunnan, China
    2 Baoshan Prefecture Center for Disease Control and Prevention, Baoshan 678000, Yunnan, China

Received date: 2025-04-09

  Revised date: 2025-07-23

  Online published: 2025-10-10

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Abstract

Scrub typhus surveillance data in Changning County from January 1, 2014 to December 31, 2023 were collected from the China Disease Prevention and Control Information System, and a descriptive epidemiological analysis was performed using the software SPSS 27.0. Spatial autocorrelation analysis was performed, and Moran’s I was calculated. The concentration index (M value) of scrub typhus was calculated to analyze the seasonal characteristics of the disease. A total of 2 861 scrub typhus cases were reported in Changning County from 2014 to 2023, with an average annual incidence rate of 83.19/105 and including one death. The incidence of scrub typhus increased from 30.69/105 in 2014 to 166.97/105 in 2023, which appeared an overall tendency towards a rise (χ2trend = 553.555, P < 0.01). The peak incidence period is July to October each year, accounting for 91.26% (2 611/2 861) of reported cases. Concentration results showed that the highest M value was 0.905 in 2014, and the M values ​​for the remaining years ranged from 0.741 to 0.862, indicating that scrub typhus has a strong seasonal pattern. The scrub typhus cases were distributed across 13 townships in the county, the top five townships with the highest average annual reported incidence rates were Wengdu (353.10/105), Mengtong (189.42/105), Datianba (172.23/105), Gengga (160.00/105), and Jifei (103.97/105). The average annual incidence rates in the remaining townships were all below 60/105. The global spatial autocorrelation analysis indicated that for the period 2014-2023, all Moran’s I values were positive and statistically non-significant (P > 0.05). Males accounted for 49.91% (1 428/2 861), while females accounted for 50.09% (1 433/2 861). The cases distributed across all age groups, which were predominantly found at ages of 0 to 4 years (12.62%, 361/2 861) and 40 to 59 years (40.62%, 1 162/2 861), respectively. Farmers constituted the majority of the occupational distribution (74.00%, 2 117/2 861), and were primarily reported by township healthcare centers (52.25%, 1 495/2 861). These data demonstrate that the prevalence of scrub typhus showed an overall upward tendency in Changning County with a strong seasonality, distinct geographical and population distribution characteristics. Prevention and control efforts of scrub typhus should focus on rural areas during the transmission season.

Key words： Scrub typhus; Changning County; Epidemiology characteristic; Surveillance

Cite this article

TIAN Yuxiu , HUANG Dongsheng . Epidemiological characteristics of scrub typhus in Changning County, Yunnan Province from 2014 to 2023[J]. CHINESE JOURNAL OF PARASITOLOGY AND PARASITIC DISEASES, 2025 , 43(5) : 723 -726 . DOI: 10.12140/j.issn.1000-7423.2025.05.019

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