TYPES OF HOSTS


TYPES OF HOSTS

           Hosts are the animals which lodge parasites.  They are larger than the parasites in size. Different types of hosts are,

1.Primary/definitive host  ,

2.Intermediate/Secondary host.

3. Reservoir host

4. Vector.

1. PRIMARY HOST: It is the host that harbours  the adult stage or sexually mature stage of a parasite or the host in which the parasite undergoes sexual reproduction.

e.g., Man is the primary host for  Wuchereria  bancrofti,

         Female anopheles mosquito is the primary host for Plasmdium  vivax.

2.SECONDARY HOST: Is the host that harbours  the developing larval or immature or asexual stages of a parasite or the host in which the parasite undergoes asexual reproduction.

e.g, Man is the secondary host for plasmodium vivax,

       Female culex mosquito is the secondary host for Wuchereria bancrofti.

3.RESERVOIR HOST: It is the host that lodges the infective stages of a paraite  in its body when the main host is not available. In the reservoir host , the parasite neither undergoes development nor causes any disease.

e.g., Monkey for plasmodium ,

African antelope for Trypanosoma  gambiency ,etc.,

4.VECTOR:  Vector is an organism which transfers the infective stages of a parasite from on main host to another .

Vectors are of two types , namely;

A)  Mechanical vector ,

B)  Biological vector.

A)  MECHANICAL VECTOR: It is the vector , which merely transfers the infective stages of a parasite but no part of the parasitic development takes place in it.

e.g.,  Houseflies and Cockroaches in the case of Entamoeba.

 B) BIOLOGICAL VECTOR: It is the vector in which the parasite   undergoes a part o the development  before it gets transferred to another host.

e.g.,  Female anopheles mosquito in the case of Plasmodium and Female culex  mosquioto in the case of  Wuchereria.

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About balarangaiahnarapuram

TEACHER M.Sc in ZOOLOGY M.Sc in PSYCHOLOGY B.Ed
This entry was posted in BIOLOGY IN HUMAN WELFARE and tagged , , , , , . Bookmark the permalink.

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