Effect of temperature on the Bulinus globosus-Schistosoma haematobium system  

作　　者：Chester Kalinda Moses J.Chimbari Samson Mukaratirwa 

机构地区：[1]School of Nursing and Public Health,College of Health Sciences,Howard College Campus,University of KwaZulu-Natal,Durban,South Africa [2]School of Life Sciences,College of Agriculture,Engineering and Science,Westville Campus,University of KwaZulu-Natal,Durban,South Africa

出　　处：《Infectious Diseases of Poverty》2017年第1期495-501,共7页贫困所致传染病（英文）

基　　金：The study received financial support from University of KwaZulu-Natal College of Health Sciences through the student scholarship programme,and from United Nations International Children's Fund/United Nations Development Programme/World Bank/World Health Organization Special Programme for Research and Training in Tropical Diseases;from the Canadian International Development Research Centre through their support towards a Malaria and Bilharzia in Southern Africa project.

摘　　要：Background:Given that increase in temperature may alter host-parasite relationships,the anticipated rise in temperature due to global warming might change transmission patterns of certain diseases.However,the extent to which this will happen is not well understood.Methods:Using a host-parasite system involving Bulinus globosus and Schistosoma haematobium,we assessed the effect of temperature on snail fecundity,growth,survival and parasite development under laboratory conditions.Results:Our results show that temperature may have a non-linear effect on snail fecundity and snail growth.Snails maintained at 15.5℃ and 36.0℃ did not produce egg masses while those maintained at 25.8℃ laid 344 and 105 more egg masses than snails at 31.0℃ and 21.2℃,respectively.Attainment of patency led to a reduction in egg mass production among the snails.However,the reduction in fecundity for snails maintained at 21.2℃ occurred before snails started shedding cercariae.Parasite development was accelerated at high temperatures with snails maintained at 31.0℃ reaching patency after three weeks.Furthermore,snail growth rate was highest at 25.8℃ while it was inhibited at 15.5℃ and reduced at 31.0℃.Increase in temperature increased snail mortality rates.Snails maintained at 36.0℃ had the shortest survival time while those maintained at 15.5℃ had the longest survival time.Conclusions:We concluded that temperature influences fecunxdity,growth,survival and parasite development in the snail and thus dictates the time it takes the parasite to complete the life cycle.This has implications on transmission of schistosomiasis in the context of global warming.

关 键 词：Bulinus globosus CERCARIAE Development rate FECUNDITY SCHISTOSOMIASIS Schistosoma haematobium TEMPERATURE 

分 类 号：R73[医药卫生—肿瘤]