define passive immunity and its subtype_??
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define passive immunity and its subtype_??
Passive immunity: When ready made antibodies are directly given to protect the body against foreign agent, it is called passive immunity.
- Natural passive immunity: The yellowish fluid colostrum secreted by mother during initial days of lactation has abundant antibodies (IgA) to protect the infant. The foetus also receives some antibodies IgG from their mother, through the placenta during pregnancy.
- Artificial passive immunity: When preformed antibodies are directly injected into the body. e.g., Anti-venom after snake bite, Anti-tetanus serum (ATS).
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