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Department of Microbiology and Parasitology, SSMU
医学寄生虫学(Medical parasitology)Medical parasitology，the study of animality pathogen动物性病原体 harming human health, is one of basic science of preventive medicine and clinical medicine. It studies the pathogenic parasites寄生虫 and their relationships to the hosts宿主 and environment.it consists of medical protozoology医学原虫学, medical helminthology医学蠕虫学 and medical entomology医学节肢动物学.
A large mass of Ascaris lumbricoides that was passed from the intestinal tract. The ruler at the bottom of the image is 4 cm (about 1.5 inches) in length.
Any organism that spends a portion or all of its life intimately associated with another living organism of a different species is known as symbiont 共生者, and the relationship is designated as symbiosis.
Commensalism共栖现象denotes an association that is beneficial to one partner and the neither benefited nor damaged to the other.
Mutualism互利共生 is seen when such associations are beneficial to both organisms.
Parasitism寄生现象is a symbiotic relationship in which one animal, the host宿主, is to degree injured through the activities of the other, the parasite寄生虫.Parasite usually is the smaller of the two organisms.
二、 life cycle（生活史 ）
The parasitic life cycle is the obligatory of parasites for their growth, development and multiplication that may be accomplished in their host (or hosts) or environment.
Stage in man
treatment and diagnosis) Stool
Urine Mouth Bronchial
(Epidemiology and Prophylaxis)
Stage left man
Stage in environment (vector)
patient, carrier and reservoir host
water, food, soil, air, insect vector and so on
People except those will special background are all susceptible to parasitic infection.
The intestinal nematodes
The blood- and tissue dwelling nematodes
Life cyclePathogenicname Pathogenesis
stage outside name Epidemiology
(vector, other host) name Prevention