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Parasitology
What is parasite
The parasite is a living creature (single or multicellular) that spends apart or all its life cycle in symbiosis with another different living creature to get food and inhabitation source
Type of realationship of creature
A-phoresis In this Kind of the relation ,the smaller kind of the organism which is phorant is carried mechanically by the bigger one which is the host and there is no phsyological relation between the two creatures As in the case of shifting Entamoeba histolytica by the flies legs because the flies allow Entamoeba to shift involuntary .the life the organism and their continuous is not connected whith this relation that comes accidentally
B- commensalism In this kind the relation is that one organism which is the commensal depends on another creature which is the host to get food or food and shalter as the relation of Entamoeba coli that in the humans guts
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C- mutualism In this kind of coexistence ,each organism depends phsyologically on each other and no one can live alone each other as in flagellated protozoa that lives in the digestive system of the termites flay.these flagellated protozoa totally depends on the carbohydrate and they get their food from the wood as celluiiose that the host eat instead of this flagellated protozoa secrate Enzymes that able to digest the cellulose so the host gets .the benefit in digesting the food (because the host is not able to make thes enzymes.
D-parasitism The relation between two different organisms one lives which is the parasite on the another which is the host permanently or temporary on the host surface or inside if where the parasite takes benefit and the host is damaged
The relation between the parasite and the host
1-spatial relationship It means that the parasite use apart of the body of the host and the parasites are
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A-External parasite or Ectoparasite They live outside the body of the host like the flea,bugs and lice and the infection is external injury.
B-internal parasites or endoparasites These parasites live inside the body of the host and some have their own place like tape worms and trematodes and the contagion with them is called infection c-intercellular parasite these parasites live in the histological fluid among the cell 2- time relationship It means the time the parasite spends on the surface or inside the host
Type of parasite
+ 1-perminant parasite These parasite live on the host permenantly and they are parasitical all their periods life
2- Temporary parasite These parasites visit the host in different times to get food. 3-obligatory parasite These parasites totally depend on the host through all or some periods of their life and they live in a parasitical way
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4-facultative parasite These parasites can live free or parasitical some intrusive when there is a chance for intrusive ,but when there is host they can live freely
5-incidental parasite This parasite that sometimes appears in a host but not the normal host for it though it can live reproduced as in Fasciola hepatica its original hosts are sheep and animals that eat grass and it may appear on dogs ,cats and even human being 6- Erratic or wandering parasite This parasite appears in unusuall places in the host or it is lost its way inside the body of the host for many reasons.
Type of host
1-Essential or final host In this host the parasite reaches its sexual maturity or it is the host that exist in it the adult parasite.
2- intermediate host or secondary host It is the host that the larval stage grow in it .it means that non-sexual reproduction of parasite happens
3- carrier host He is the person who hosts the infective stage of parasite with some disease symptoms or with out symptoms and he is asource of infection and often it is from patients in
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the recovery period and they still carrying the phathogin inspite of the disappearance of clinical symptoms and it may be the reason behind disappearance of the symptoms and it may be the reason behind disappearance of the symptoms because of the resistance of the body for the cause of the sickness or the ability of coexistence of the body withit
4- vector host It is the host which is responsible to shift the parasite from final host to another final host and there is no growing happens for the parasite in the vector host .this is usually exist in Arthropods . If the transportation is not essential in the life cycle ,it is considered mechanical vactor and if the transporation is essential in the life cycle ,that means the parasite grows up an reproduces, we call it biological vector.
5- Reservoir host it is the host which lives normally and it carries a disease factor without adamage happens for it and it is a source of the infection of other animals.
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