Epidemiological characteristics of hemorrhagic fever with renal syndrome and surveillance of host animals in Gannan Prefecture from 2012 to 2022
Objective To analyze the epidemiological characteristics of hemorrhagic fever with renal syndrome(HFRS)and host animal monitoring data in Gannan Tibetan Autonomous Prefecture(Gannan Prefecture)from 2012 to 2022 to further improve the ability of prevention and control of HFRS.Methods Descriptive statistics were used to analyze the incidence of HFRS by time,area and population distribution,using data from China's National Notifiable Disease Reporting System(NNDRS)reported in Gannan Prefecture from 2012 to 2022.The correlation between HFRS incidence and rodent density in surveillance areas was evaluated.The test level was α=0.05.Results A total of 236 HFRS cases were reported in Gannan Prefecture from 2012 to 2022,with an annual average incidence of 3.10 per 105 population.No deaths were reported.The HFRS incidence(12.43/105)was highest in 2019,then decreased yearly.The majority(89.83％)of the reported cases occurred during October to February of the following year.The HFRS cases were reported only in 2 counties in 2012,but 6 counties in 2020 and 2021.HFRS Cases were reported in 6 townships of 13 townships in Xiahe County,accounted for 62.71％of the total cases in Gannan Prefecture.The male to female ratio of HFRS cases was 1.88:1,and the highest number of HFRS cases was reported in those aged 30-59 years.Most(69.92％)cases were herdsmen.The dominant rodent specie in surveillance areas was house mouse(51.06％)during 2020 to 2022.The rodents density in residential areas was significantly higher than that in the wild areas(2.46％vs.1.01％;x2=4.876,P=0.027).The rodent density was positively correlated with HFRS incidence of population in surveillance areas(r=0.954,P＜0.001).Conclusions During 2012 to 2022,the HFRS incidence has shown a downward trend after the peak in 2019 in Gannan Prefecture,but the number of counties with HFRS cases increased.Prevention and control measures for HFRS should focus on those who were men,middle-aged and herdsmen,especially in autumn and winter.In those areas with a high HFRS incidence like Xiahe County,it is necessary to employ effective control measures for rodents.
hemorrhagic fever with renal syndromeepidemiological characteristicshost animal
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