Types of trematodes infecting freshwater snails found in irrigation canals in the East Nile locality,Khartoum,Sudan  

作　　者：Nidal A.I.Mohammed Henry Madsen Abdel Aziz A.R.M.Ahmed 

机构地区：[1]Department of Zoology,Khartoum College of Medical Sciences,Khartoum,Sudan [2]Parasitology and Aquatic Diseases,Department of Veterinary Disease Biology,Faculty of Health and Medical Sciences,University of Copenhagen,Frederiksberg,Denmark [3]Education Expert Company,Riyadh,Kingdom of Saudi Arabia

出　　处：《Infectious Diseases of Poverty》2016年第1期139-148,共10页贫困所致传染病（英文）

摘　　要：Background:The planorbid freshwater snails of the two genera,Biomphalaria and Bulinus-have been vigorously studied due to the role they play as intermediate hosts of schistosomiasis.In Sudan specifically,most studies have focused on the chemical and ecological control of the two genera,but few studies have looked at their biological control.This study explored the coexistence of other species of freshwater snails and the two genera along with their trematode infections in relation to a number of environmental factors in the East Nile locality,Khartoum state,Sudan.Methods:Freshwater snails from irrigation canals(abueshreens)were sampled monthly from January 2004 to December 2005.The snails were examined for trematode infections by cercarial emergence immediately after collection and then weekly for an additional four weeks to allow for the maturation of prepatent infections.Vegetation cover in the study sites as well as the physicochemical characteristics of the water,including temperature,were also recorded.Results:A total of 10,493 snails,representing seven species,were collected.The most abundant species was Biomphalaria pfeifferi,representing 48.6%of the sample.Overall,14.1%of the snails were found to be shedding some type of cercariae.Five species were found to have infections;among these the Bulinus truncatus species was found to be the most heavily infected,with an overall prevalence of 46.2%.Double infections were recorded in only two B.truncatus snails and one Cleopatra bulimoides snail.Twenty different morphotypes of cercariae were recorded,seven of which appeared not to conform to previously described cercariae from Africa.Xiphidiocercariae type 1 was the most common type of cercariae recovered,accounting for 44.3% of all infections.The density of snails tended to be lower during the summer months than the winter months,except for M.tuberculata snails,which were not affected by seasonal changes.Conclusion:The findings of this study indicate that besides schistosomes,other larval trematodes are found,and

关 键 词：Freshwater snails Trematode cercariae Biomphalaria BULINUS East Nile locality Khartoum SUDAN 

分 类 号：P73[天文地球—海洋科学]