Seasonal characteristics of severe fever with thrombocytopenia syndrome analyzed with concentration ratio and circular distribution method in Weihai, Shandong Province, China

SUN Qi, ZHANG Guo-ying, GAO Yong-wei

doi:10.11853/j.issn.1003.8280.2023.06.016

Chinese Journal of Vector Biology and Control >

2023 , Vol. 34 >Issue 6: 794 - 798

DOI: https://doi.org/10.11853/j.issn.1003.8280.2023.06.016

Technology and Method

Seasonal characteristics of severe fever with thrombocytopenia syndrome analyzed with concentration ratio and circular distribution method in Weihai, Shandong Province, China

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1. Department of Microbial Detection/Department of Infectious Disease Control, Weihai Center for Disease Control and Prevention, Weihai, Shandong 264200, China;
2. Huancui District Center for Animal Disease Prevention and Control of Weihai, Weihai, Shandong 264200, China

Received date: 2023-04-25

Online published: 2023-12-26

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Abstract

Objective To analyze the seasonal distribution of severe fever with thrombocytopenia syndrome (SFTS) in Weihai, Shandong Province, China, so as to provide scientific evidence for formulating prevention and control strategies for SFTS.Methods The monthly data on SFTS cases with registered addresses in Weihai during 2011 to 2022 were collected from the China Information System for Disease Control and Prevention. The seasonal characteristics of SFTS in Weihai were analyzed by using the concentration ratio and circular distribution method through creating formulas in Excel 2007.Results From 2011-2022, the total number of cases of SFTS in Weihai was 1 231. The mean annual incidence was 4.01/100 000, and the mortality rate was 0.37/100 000. The incidence of SFTS showed a generally ascending trend during the 12 years (linear χ²=36.501, P<0.001). The concentration ratio (M) of monthly numbers of SFTS cases in Weihai was 0.66, indicating strong seasonality. The circular distribution concentration trend (r) was 0.654, the angular mean (αˉ) was 195.15°, the angular deviation (S) was 52.76°, and the Z value for the Rayleigh test was 527.144 (P<0.001). The predicted peak date was July 17, and the peak period was between May 25 and September 9.Conclusions The overall increasing incidence of SFTS in Weihai of Shandong Province deserves adequate attention to prevention and control. The strong seasonality of SFTS indicates that prevention and control strategies should be carried out prior to the peak period, so as to reduce severe cases and cluster outbreaks. The results provide a basis for scientific prevention and control of SFTS.

Key words： Concentration ratio; Circular distribution; Severe fever with thrombocytopenia syndrome; Seasonality; Weihai

Cite this article

SUN Qi, ZHANG Guo-ying, GAO Yong-wei . Seasonal characteristics of severe fever with thrombocytopenia syndrome analyzed with concentration ratio and circular distribution method in Weihai, Shandong Province, China[J]. Chinese Journal of Vector Biology and Control, 2023 , 34(6) : 794 -798 . DOI: 10.11853/j.issn.1003.8280.2023.06.016

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