Vector Control

Parasites are transmitted from one host to another by vectors, often utilizing the stage in the vector to undergo multiplication or development. In some parasites (e.g. malaria) the vector is the definitive host, whereas in others such as Wuchereria ban-crofti, it is the intermediate host. Whichever part the vector plays, it is a vital one for the parasite and it cannot continue if the vector is destroyed or reduced to sufficiently low numbers. The time of changing from one host to another is a precarious time for the parasite and considerable loss may occur. Malaria gametocyte development must coincide with a mosquito taking a blood meal and both male and female gametocytes are required for fertilization and maturation to take place in the insect's stomach. W. bancrofti suffers considerable parasite loss during the vector stage. The vector, therefore, does not have to be completely destroyed, but must be kept at levels too low for transmission to take place. So vector control means vector reduction and not vector eradication.

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Allergy Relief

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