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IgA and IgG antibodies provide which of the following kinds of immunity to the infant or foetus?

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in Biology – Class 12 by (271k points)
IgA and IgG antibodies provide which of the following kinds of immunity to the infant or foetus?

(a) Natural Active Immunity

(b) Natural Passive Immunity

(c) Artificial Active Immunity

(d) Artificial Passive Immunity

I have been asked this question during an interview.

My enquiry is from Human Health and Disease in chapter Human Health and Disease of Biology – Class 12

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Correct answer is (b) Natural Passive Immunity

For explanation I would say: IgA and IgG antibodies provide natural passive immunity to the infant or the foetus. The colostrum secreted by the mother during the initial days of lactation has an abundant amount of IgA antibodies to protect the infant. The foetus also receives some IgG antibodies from their mother through the placenta during pregnancy.

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