what is immunity ? what is important way to build immunity
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==> The ability of an organism to resist a particular infection or toxin by the action of specific antibodies or sensitized white blood cells.
"immunity to typhoid seems to have increased spontaneously"
==> Naturally acquired active immunity occurs when a person is exposed to a live pathogen, and develops a primary immune response, which leads to immunological memory. This type of immunity is "natural" because it is not induced by deliberate exposure.
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