Recent estimates of prevalence of parasites in the world are:
Ascaris
1.5billion
Hookworms
1.3 billion
Whipworms
1 billion
Filarial worms
657 million
Malaria
500 million
5.3×105
2000’s 3×104
8.4×105 eliminated eliminated 1.94×108
3.93×107 (2001~04)
Intestinal helminths (1.29×108) 2004年第二次寄调 Food-borne parasitosis 食物源性寄生虫病
继续发育)的阶段
Kinds of life cycles Direct life cycle:
Ex:Enterobius vermicularis
In which the parasite is passed from host to the next through
the
contaminated food or water, it doesn’t need intermediate
In other words, One partner (the parasite) harms or lives on the expense of the other (the host)
Parasites are smart!
Definition of parasite, host and parasitism
思考: 1. 寄生虫(寄生虫病)的研究发展史。 2. 人类能最终战胜寄生虫病吗?