In medicine, a vector is a carrier. The best
way to understand a vector is to recall its origin as a word. Vector
is the Latin word for a "bearer."
In parasitology (the study of parasitic organisms), the vector
carries the parasitic agent. For example, in malaria a mosquito
serves as the vector that carries and transfers the infectious agent
(Plasmodium), injecting it with a bite.
In molecular biology, a vector may be a virus (or a
plasmid); a piece of foreign DNA is inserted in the vector genome to
be carried and introduced into a recipient (host) cell.
In physics, there are vectors but they go beyond the biomedical
realm (except in cardiology).
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