arboviruses - ArthropodborneViruses AnOverview...

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    Arthropod-borne Viruses An Overview
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Arthropod-borne Viruses Arthropod-borne viruses (arboviruses) are viruses that can be transmitted to man by arthropod vectors. The WHO definition is as follows “Viruses maintained in nature principally, or to an important extent, through biological transmission between susceptible vertebrate hosts by haematophagus arthropods or through transovarian and possibly venereal transmission in arthropods.” Arboviruses belong to three families 1. Togaviruses e.g. EEE, WEE, and VEE 2. Bunyaviruses e.g. Sandfly Fever, Rift Valley Fever, Crimean-Congo Haemorrhagic Fever 3. Flaviviruses e.g. Yellow Fever, dengue, Japanese Encephalitis
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Transmission Cycles Man - arthropod -man e.g. dengue, urban yellow fever. Reservoir may be in either man or arthropod vector. In the latter transovarial transmission may take place. Animal - arthropod vector - man e.g. Japanese encephalitis, EEE, WEE, jungle yellow fever. The reservoir is in an animal. The virus is maintained in nature in a transmission cycle involving the arthropod vector and animal. Man becomes infected incidentally. Both cycles may be seen with some arboviruses such as yellow fever.
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Man-Arthropod-Man Cycle 
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Animal-Arthropod-Man Cycle
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Mosquitoes Japanese encephalitis, dengue, yellow fever, St. Louis encephalitis, EEE, WEE, VEE etc. Ticks
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This note was uploaded on 12/27/2011 for the course STEP 1 taught by Professor Dr.aslam during the Fall '11 term at Montgomery College.

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arboviruses - ArthropodborneViruses AnOverview...

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