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Difference between active and passive immunity …

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Difference between active and passive immunity ?
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Sia ? 2 years, 10 months ago

Active Immunity Passive Immunity
Active immunity is usually permanent – it is produced by the antibodies of the host in response to direct contact of an antigen Passive immunity lasts only for a few weeks or months. It is produced by the introduction of antibodies from outside to the host
It produces an immunological memory It does not produce immunological memory
When the antigens enter the body, antibodies and other specialised lymphocytes are produced Antibodies are introduced from an external source. For instance, a mother introduces antibodies to a fetus through the placenta and to an infant via mother’s milk.
There are no side-effects It may cause reactions
Immunity does not occur immediately Immunity develops immediately
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