Traditionally in medicine, a vector is an organism that does not cause disease itself but which spreads infection by conveying pathogens from one host to another.
See also:
Species of mosquito, for example, serve as vectors for the deadly disease Malaria.
This sense of "biological vector" is the primary one in epidemiology and in common speech. In gene therapy, a virus itself may serve as a vector, if it has been re-engineered and is used to deliver a gene to its target cell.
A "vector" in this sense is a vehicle for delivering genetic material such as DNA to a cell..
For more information about the topic Vector (biology), read the full article at Wikipedia.org, or see the following related articles:
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