Vaccination. Immunizations work by stim ulating the immune
system, the natural disease-fighting system of the body. The healthy immune system
is able to recognize invading bacteria and viruses and produce substances (antibodies)
to destroy or disable them. Immunizations prepare the immune system to ward off
a disease. To immunize against viral diseases, the virus used in the vaccine has
been weakened or killed. To immunize against bacterial diseases, it is generally
possible to use only a small portion of the dead bacteria to stimulate the formation
of antibodies against the whole bacteria. In addition to the initial immunization
process, it has been found that the effectiveness of immunizations can be improved
by periodic repeat injections or "boosters." Also see Immunizations (in the plural)
and Immunization of a specific type (such Immunization, Polio).
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