nullMedical Parasitology Medical Parasitology Southern Medical University Department of Pathogenic Biology
Zheng Xueli (郑学礼)
Ph.D. Professor nullnullnullnullnullnullnullnullnullnull4. 寄生现象 、寄生虫与宿主 两种生物在一起生活,其中一方受益,另一方既不受益,也不受害,称为共栖。(1)共栖(commensalism)null4. 寄生现象 、寄生虫与宿主(2) 互利共生(mutualism)
两种生物在一起生活,在营养上互相依赖,长期共生,双方有利,称为互利共生
(Commensalism is the association of two different organisms, in which one partner is benefited while the other neither benefited nor injured, such as E. coli and man.)。nullnull 两种生物在一起生活,其中一方受益,另一方受害,后者给前者提供营养物质和居住长所,这种关系称为寄生。受害的一方为宿主,受益的一方为寄生物(parasite)(Parasitism(寄生关系)is the association of two different organisms, in which one partner is benefited while the other is injured, such as Ascaris lumbricoides and man.).(3) 寄生(parasitism)4. 寄生现象 、寄生虫与宿主nullnull5. 寄生虫的生活史及类型(1) 生活史(life cycle) (2) 生活史类型
1)直接型:完成生活史不需要中间宿主2)间接型:完成生活史需要中间宿主null A direct life cycle is one in which the organism is passed from one host to the next through the air , by a formite , or in contaminated food ot water 。null In an indirect life cycle , the organism develops or multiplies in a vector organ intermediate host . A vector ( or intermediate host ) is an invertebrate organism that transmits the parasitc agent from one vertebrate host to next .null● 中间宿主(intermediate host)
● 终宿主 (definitive host )
● 储蓄宿主( reservoir host )
● 转续宿主(paratenic /transport host ) 6.宿主的类别HOST TYPESnull6.宿主的类别HOST TYPESnullnull8.寄生虫与宿主的相互作用(1) 寄生虫对宿主的作用1)夺取营养
2)机械损伤
3)毒性和抗原物质的作用nullnullnullnullnullnull 自然因素
生物因素
社会因素nullnull荒漠型的利什曼病 (野生动物)
白蛉 ↙ ↘ 白蛉
大沙鼠 ← →大沙鼠
↙ ↓
白蛉 白蛉
人
荒漠型的利什曼病自然疫源地
null思考
题
快递公司问题件快递公司问题件货款处理关于圆的周长面积重点题型关于解方程组的题及答案关于南海问题
思考题1.寄生虫与宿主的基本概念?
2.寄生虫病流行的基本环节与特点?
3.WHO界定的“六大热带病”及我国最流行的“五大寄生虫病”是什么?