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

doi:10.12140/j.issn.1000-7423.2025.05.019

Abstract

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 (χ²_trend = 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

CLC Number:

R513.2

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.

Figures/Tables 3

References 16

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特征	例数	构成比/%
性别
男	1 428	49.91
女	1 433	50.09
年龄组/岁
0~4	361	12.62
5~9	203	7.10
10~14	79	2.76
15~19	64	2.24
20~24	77	2.69
25~29	140	4.89
30~34	149	5.21
35~39	180	6.29
40~44	214	7.48
45~49	329	11.50
50~54	323	11.29
55~59	296	10.35
60~64	175	6.12
65~69	144	5.03
70~74	79	2.76
75~79	31	1.08
80~84	13	0.45
≥ 85	4	0.14
合计	2 861	100