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 ,
3. Reservoir host
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.