Immunity resulting from the development of antibodies in response to the presence of an antigen, as from vaccination or exposure to an infectious disease.
| active formaldehyde, active fatty acid, active centre | |
| active immunization, active methionine, active methyl |
Resistance to a disease or other biological or chemical agents acquired naturally as a result of exposure to the disease or agent; can also be acquired artificially by use of a vaccine containing a weakened or deadened form of the agent, stimulating the immune system to produce antibodies long after the initial exposure.
