Journal of Tropical Diseases and Parasitology ›› 2024, Vol. 22 ›› Issue (5): 262-266.doi: 10.20199/j.issn.1672-2302.2024.05.002

• SPECIAL TOPICS ON SEVERE FEVER WITH THROMBOCYTOPENIA SYNDROME • Previous Articles     Next Articles

Analysis on the seasonal characteristics of sever fever with thrombocytopenia syndrome in Anhui Province from 2010 to 2023

GENG Haoxiang1(), CHU Na2, LI Ming2, CHU Xiujie2, SUN Yong2, CHEN Qingqing2, GONG Lei1,2()   

  1. 1 Department Epidemiology and Health Statistics, of School of Public Health, Anhui Medical University, Hefei 230032, Anhui Province, China
    2 Anhui Provincial Center for Disease Control and Prevention
  • Received:2024-06-04 Online:2024-10-20 Published:2024-11-15
  • Contact: GONG Lei, E-mail: gong0516@sina.com

Abstract:

Objective To investigate the seasonal patterns of severe fever with thrombocytopenia syndrome (SFTS) in population in Anhui Province for evidence to prevent and control this infection. Methods Monthly reported cases of SFTS, including deaths in Anhui Province were collected from 2010 to 2023 through the Infectious Disease Monitoring Information System under the China Information System for Disease Control and Prevention. The concentration method was used to analyze the seasonal intensity of SFTS, and circular distribution method was used to analyze the peak days and epidemic peaks of SFTS. Results In total, 5 715 cases of SFTS and 184 deaths were reported in Anhui Province from 2010 to 2023. The average annual incidence was 0.661 6 per 100 000 population, and the case fatality rate was 3.22%. The incidence rate showed an overall upward trend (χ2trend=3 518.04, P<0.01), with the lowest morbidity increasing from 0.001 6/100 000 in 2010 to the highest 2.310 9/100 000 in 2023. The total M-value of monthly incidence concentration of SFTS was 0.538 in Anhui Province from 2010 through 2023, which indicated strong seasonality. The circular distribution analysis demonstrated that the peak incidence date of SFTS in Anhui Province was on June 2 in spring and summer seasons (March-August), and the peak epidemiological period was between April 20 and July 15. The peak incidence date was found on October 9 in autumn and winter seasons (September-February), and the peak epidemiological period was between September 16 and November 1. Conclusion The incidence of SFTS in Anhui Province has strong seasonal characteristics, showing a double-peak distribution by primary and secondary peak. Our findings suggest that effective prevention and control measures should be taken before arrival of the peak epidemic in order to reduce the occurrence of SFTS.

Key words: Sever fever with thrombocytopenia syndrome, Seasonal characteristics, Concentration method, Circular distribution method

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