Discuss The Roles And Importance Of Disease Vectors In The Transmission Of Diseases

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1. What is a disease vector? Discuss the roles and importance of disease vectors in the transmission of diseases. 25 pts. A disease vector is any agent that transmits and carries an infectious pathogen into another living organism. These vectors have immunity to the pathogen and thus allows for the successful transport of the pathogen. Not every vector is able to carry every pathogen and ecological restrains also limit the spread of the disease due to the inability of the vector to survive in different kinds of environments. Arthropods can serve as vectors and play an important role in disease transmission. These vectors include mosquitoes, fleas, sand flies, lice, ticks, and mites. They are responsible for the transmission of several diseases. These vectors feed on blood at some or all stages of their life cycles. The hematophagous lifestyle of these arthropods allows the pathogens to enter the blood stream of the host. For example, the anopheles mosquito is a vector for malaria, filariasis, and arboviruses. It pierces its mouthpart on the skin and feeds on the hosts. The pathogens carried by the mosquito, which are located within its salivary glands, are transmitted as the mosquito is feeding on the host blood. This enables the mosquito to directly transfer the pathogens into the blood stream of the host. Another example of an arthropod vector is the sand and black fly. They are considered to be pool feeders and are responsible for Leishmaniasis and Onchocerciasis

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