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21 January, 18:33

Infants are born with a passive immunity that occurs when immunoglobulin antibodies cross the placenta from the maternal circulation prior to birth. Which immunoglobulin is capable of crossing the placenta?

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  1. 21 January, 22:31
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    Immunoglobulin G (IgG)

    Explanation:

    There are five classes of human antibodies:

    IgG IgM IgD IgA IgE

    IgG is the most abundant and the only one capable of crossing the placenta. IgG is present in all body fluids and protects against infections.
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