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Objective:To ascertain the endemic status of paragonimiasis in Zhejiang Province.Methods:From 2005 to 2020, 2-3 villages in 1-2 counties (cities, districts, hereinafter refferred to as counties) in historical endemic areas of paragonimiasis in Zhejiang Province were selected for monitoring each year. In each village, 50 to 150 local residents were selected as monitoring subjects, venous blood samples were collected, and serum Paragonimus antibody was detected by enzyme-linked immunosorbent assay (ELISA). Fifty to 100 intermediate hosts crabs or crayfish were collected in each village, and the infection of Paragonimus metacercaria was detected by crushing precipitation. Results:The positive rate of Paragonimus antibody was 2.9% (94/3 297); 3 929 crabs or crayfish were divided into 2 749 groups, 790 of which were found to have Paragonimus metacercaria infection, with a Paragonimus metacercaria infection rate of 28.7%. Conclusions:Paragonimus transmission chain exists in some counties of Zhejiang Province, which still has the potential risk of Paragonimus epidemic. Therefore, it is necessary to strengthen monitoring and carry out extensive health education to improve residents' self-protection awareness.
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Objective To understand the demographic characteristics and clinical features of hookworm infectors in high infection area in South Mountain area of Zhejiang Province,and to find the risk factors of infection,so as to provide the evidence for formulating prevention and control measures.Methods In 2018,according to the soil-borne nematode monitoring results of the previous year in Zhejiang Province,three villages with relatively more hookworm infections were selected from Qingtian County in South Mountain area of Zhejiang Province,and more than 10 cases of hookworm infection were selected from each survey site.A face to face questionnaire survey was conducted by all investigators using a questionnaire designed by the Center for Infectious Disease Control and Prevention,Zhejiang Provincial Center for Disease Control and Prevention,and information on the general condition,past diagnosis history,clinical symptoms and risk factors of infection of infected persons were collected.The stool samples were collected and tested for infection by modified Kato-Katz method to evaluate the drug deworming effect in the previous year.Results A total of 33 cases of hookworm infection were investigated,including 18 males and 15 females;the age ranged from 33-85 years old,mainly concentrated in 60-79 years old,a total of 23 cases (69.7％).Ten cases (30.3％) had been diagnosed with hookworm disease;19 cases (57.6％) had similar symptoms of hooky dermatitis;and 12 cases (36.4％) had gastrointestinal symptoms in the past three years.There were 31 cases (93.9％) worked in the field for more than one month each year,18 cases (54.5％) used fresh manure directly at home,6 cases (18.2％) were used to working barefoot in the field,and 30 cases (90.9％) used to wearing slippers in the field.A total of 32 eligible stool samples were examined,and 4 case (12.5％) were still positive for hookworm eggs.Conclusions Among the infectors,fertilizing with fresh stool,working barefoot or wearing slippers in the field may serve as the risk factors.There is a certain failure proportion to eliminate the infection status when adopting only one round anthelminthic treatment.For prevention and control hookworm infections,comprehensive intervention measures including infection source management,harmless treatment of stools,individual behavior intervention and environment improvement are suggested.