Objective To understand the epidemiological characteristics of severe fever with thrombocytopenia syndrome (SFTS) and tick vectors in Zhejiang province of China in 2021. Methods The data on SFTS cases in Zhejiang province in 2021 were obtained from China Information System for Disease Control and Prevention, and descriptive epidemiological methods were used to describe the temporal, population, and regional distributions of SFTS cases. Tick surveillance sites were set up in 8 counties (cities/districts) of Zhejiang province from March to October 2021, and the drag-flag method was used to collect free-living ticks and the body surface examination method for on-host ticks. Excel 2013 and SPSS17.0 softwares were used to perform a statistical analysis of the data on SFTS cases and vector surveillance data, and ArcGIS 10.0 software was used to draw the map of SFTS incidence rate in districts and counties. Results A total of 85 SFTS cases were reported in Zhejiang province in 2021, with a reported incidence rate of 0.15/100 000 and a fatality rate of 8.24% (7/85). The cases were distributed in 23 counties (cities/districts) in 8 prefectures, and the top 3 prefectures in terms of the number of cases were Jinhua (27 cases), Taizhou (27 cases), and Ningbo (11 cases) cities. The cases mainly occurred in April to October, with a peak in May to July. There was no significant difference in incidence rate between the male patients and the female patients (χ2=1.347, P=0.246); as for the age of onset of SFTS, most cases were middle-aged and elderly patients, with a median age of 67 years; most of the patients were farmers, accounting for 80.00% (68/85). The patients with a clear history of tick bites within 2 weeks before SFTS onset accounted for 17.65% (15/85). A total of 590 free-living ticks were collected in the unpopulated rural area, and the mean density of free-living ticks was 18.44 ticks/flag·h. A total of 688 animals were monitored and 2 406 on-host ticks were collected, with a mean density of 3.50 ticks per host. Conclusion Sporadic cases of SFTS are mainly observed in Zhejiang province, with obvious regional and seasonal characteristics. The middle-aged and elderly people and farmers were the main affected populations. Free-living ticks and on-host ticks show a relatively high density as the vector for SFTS.
ZHANG Qian-tong, SUN Ji-min, LING Feng, SHI Xu-guang, REN Jiang-ping, GUO Song, ZHANG Rong, LIU Ying
. Analysis of reported cases of fever with thrombocytopenia syndrome and tick vectors surveillance results in Zhejiang province of China in 2021[J]. Chinese Journal of Vector Biology and Control, 2022
, 33(4)
: 485
-488
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DOI: 10.11853/j.issn.1003.8280.2022.04.008
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