External vector transmission means that the virus is on a vector that transmits it to the host by direct contact. Internal vector transmission is further broken into two more divisions, harborage and biological. Harborage means that the pathogen is taken into the vector and then moved out of the vector in the same form. Biological vector transmission differs in that the pathogen that enters the vector is altered biologically before it is inserted into the new host. The first step, and the best one, in the treatment of viral infections is prevention, and it is achieved through the use of vaccines .
Vaccines work using the body's own immune system to fight infection.
Upon introduction of the vaccine, the body responds with B-cell activation. During this primary response, antibodies are created. These antibodies bind to antigens and clear them from the bloodstream. Imunoglobulin M is the first antibody made but production some imunoglobulin G is also produced. These antibodies have a low to moderate affinity to the antigens.