Epidemic characteristics and spatial aggregation of hemorrhagic fever with renal syndrome in Heilongjiang Province,2017-2022
Objective To understand the time,region and population distribution characteristics and spatial aggregation of hemorrhagic fever with renal syndrome(HFRS)in Heilongjiang Province,and to provide a reference basis for HFRS monitoring,prevention and control.Methods Data about HFRS cases were obtained from the Infectious Disease Reporting Information Management System of Chinese Center for Disease Control and Prevention.The spatial autocorrelation analysis method was used to analyze the HFRS surveillance data from January 1,2017 to December 31,2022,and the characteristics in epidemiological distribution of time,region and population as well as spatial aggregation were described.Results A total of 5,855 HFRS cases were reported in Heilongjiang Province from 2017 to 2022.The incidence rates in 2017-2019 showed an upward trend,but then decreased year by year.The group aged 41-50 years had the largest number of cases.The proportion of male cases aged 51-60 years increased after 2021,ranking first among all age groups.The proportion of cases in people over 60 years old reached more than 20％,and the number of male cases was more than that of female ones(x2=143.76,P＜0.01).As for occupation distribution,most of the cases were farmers,and there were cases reported in each month of the year 2022,with two incidence peaks in spring-summer and autumn-winter.Global spatial autocorrelation analysis revealed that the incidence at the county-and district-level(except in 2018)presented spatial autocorrelation(Moran's I＞0,P＜0.05),indicating that there was regional aggregation in the incidence of HFRS(except in 2018).Local spatial autocorrelation analysis displayed that the number of high-high aggregation areas in 2017-2022 showed a downward trend,and on the whole,the high-high aggregation areas presented a trend of moving from northeast to southeast and then to southwest.90.63％of the fatal cases were infected with SEO-type HFRS,none of them were vaccinated,and their median of time difference from onset to diagnosis was greater than that in non-deceased cases.Conclusion The overall trend in HFRS in Heilongjiang Province showed a stable decline,but the incidence was still among the top in the country.It is necessary to continuously strengthen health education as well as prevention and control measures such as HFRS vaccination among key populations in high incidence counties and districts in the province,check the data quality of cases in counties and districts with high-low and low-high aggregation modes,analyze the causes for these modes,and increase the vaccine coverage rate as well as awareness of hospital visits in the SEO-type endemic areas of HFRS.
hemorrhagic fever with renal syndromespatial aggregationepidemic characteristic
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