ABSTRACT
Objective To monitor the epidemic status of human soil-borne nematodiasis in Danyang City, so as to provide scientific evidence for formulating control measures. Methods The soil-borne nematode infections were tested using a modified Kato-Katz technique among residents aged more than 3 years living in Danyang City from 2012 to 2018, and the Enterobius vermicularis eggs were detected using the transparent adhesive tape anal swab method among children at ages of 3 to 12 years. Results A total of 13 540 residents were monitored for soil-borne nematode infections from 2012 to 2018, and the prevalence of human soil-borne nematode infections was 0.45%. The prevalence of Ascaris lumbricoides, Trichuris trichura and Enterobius vermicularis infections was 0.32%, 0.12% and 0.01%, respectively, and a single parasite infection was predominant. There were significant differences in the prevalence of soil-borne nematode (χ2 = 42.610, P < 0.05), A. lumbricoides (χ2 = 26.276, P < 0.05) and T. trichura (χ2 = 20.692, P < 0.05). The prevalence of human soil-borne nematode infections was 0.45% in males and 0.47% in females, and lower prevalence was found in local residents than in floating population (0.28% vs. 0.66%; χ2 = 10.561, P < 0.05). The highest infection was found in subjects at ages of 31 to 40 years (0.59%), followed by in subjects at ages of 41 to 50 years (0.56%), and the lowest infection was seen in children at ages of 3 to 5 years (0.27%). In addition, the prevalence of human soilborne nematode infections varied significantly in occupation (χ2 = 75.692, P < 0.05), with the highest infection seen in boatmen. Among the 5 078 children monitored, the prevalence of E. vermicularis infection was 0.37%, and the prevalence of E. vermicularis infection varied significantly in year (χ2= 15.466, P < 0.05). Conclusion The human soil-borne nematode infection is at a low level in Danyang City; however, the surveillance of soil-borne nematodiasis remains to be intensified in children living in rural areas and immigrant populations.
ABSTRACT
Objective To monitor the epidemic status of human soil-borne nematodiasis in Danyang City, so as to provide scientific evidence for formulating control measures. Methods The soil-borne nematode infections were tested using a modified Kato-Katz technique among residents aged more than 3 years living in Danyang City from 2012 to 2018, and the Enterobius vermicularis eggs were detected using the transparent adhesive tape anal swab method among children at ages of 3 to 12 years. Results A total of 13 540 residents were monitored for soil-borne nematode infections from 2012 to 2018, and the prevalence of human soil-borne nematode infections was 0.45%. The prevalence of Ascaris lumbricoides, Trichuris trichura and Enterobius vermicularis infections was 0.32%, 0.12% and 0.01%, respectively, and a single parasite infection was predominant. There were significant differences in the prevalence of soil-borne nematode (χ2 = 42.610, P < 0.05), A. lumbricoides (χ2 = 26.276, P < 0.05) and T. trichura (χ2 = 20.692, P < 0.05). The prevalence of human soil-borne nematode infections was 0.45% in males and 0.47% in females, and lower prevalence was found in local residents than in floating population (0.28% vs. 0.66%; χ2 = 10.561, P < 0.05). The highest infection was found in subjects at ages of 31 to 40 years (0.59%), followed by in subjects at ages of 41 to 50 years (0.56%), and the lowest infection was seen in children at ages of 3 to 5 years (0.27%). In addition, the prevalence of human soilborne nematode infections varied significantly in occupation (χ2 = 75.692, P < 0.05), with the highest infection seen in boatmen. Among the 5 078 children monitored, the prevalence of E. vermicularis infection was 0.37%, and the prevalence of E. vermicularis infection varied significantly in year (χ2= 15.466, P < 0.05). Conclusion The human soil-borne nematode infection is at a low level in Danyang City; however, the surveillance of soil-borne nematodiasis remains to be intensified in children living in rural areas and immigrant populations.
ABSTRACT
Objective To analyze the epidemiological characteristics of malaria prevalence in Danyang City from 2004 to 2015,so as to provide the evidence for formulating the strategy of prevention and control of malaria. Methods The data of ma-laria serum tests,the reported malaria cases from the Internet Reporting System,and the epidemiological case survey from 2004 to 2015 as well as the mosquito monitoring data from 2008 to 2015 were collected and analyzed. Results From 2004 to 2015, 58 malaria cases were reported in Danyang City,with an average annual incidence rate of 0.6/105. Among the cases reported, vivax malaria accounted for 65.52％(38/58),falciparum malaria accounted for 5.17％(3/58),oval malaria accounted for 1.72％(1/58),and unclassified subtype accounted for 27.59％(16/58). The local infection cases accounted for 31.03％(18/58),and the imported cases accounted for 68.97％(40/58). There were no local infections since 2011. Anopheles sinensis,the only malaria vector in Danyang City,was still prevalent,but its density was low. Conclusion Imported malaria poses a serious threat to the malaria elimination achievements in Danyang City,and the surveillance and disposal of imported malaria need to be strengthened.
ABSTRACT
Objective To evaluate the effects of continuous application of niclosamide ethanolamine salt on Oncomelania hu-pensis snail control in a marshland,river and channel. Methods The Beiwei marshland in Houxiang Town,the Xiaoliang River in Lingkou Town and Laomiao channel in Yunyang Town in Danyang City were selected as study sites,and 4%niclosamide etha-nolamine salt and 26%niclosamide powder were used to kill the snails. Based on the historical records and field investigations, the effects of continuous application of niclosamide ethanolamine salt on snail control were evaluated. Results Compared with the first time of snail repetition,the snail areas decreased by 82.80%,63.14%and 70.00%in the Beiwei marshland,Xiaoliang River and Laomiao channel,respectively,in 2013. There was a positive correlation between the area and density of snails(r=0.931, 0.975 and 0.916,respectively;all P values < 0.05). The average densities of living snails decreased significantly by 92.34%, 87.91%and 97.66%,respectively. There was a negative correlation between the corrected mortality of snails and the average densi-ty of living snails in the following year,and a negative correlation between the reduction rate of living snail density and the average density of living snails in the following year. Conclusion Molluscicides plays an important role in compressing the snail area,re-ducing the snail density,and controlling the schistosomiasis transmission.