The most likely interpretation of an elevated immunoglobulin M (IgM) level in a newborn is
a. The infant was breastfed during the first hours after birth
b. Transference of immune globulins from the placenta to the infant
c. An overwhelming allergic response to an antigen
d. A recent exposure to a pathogenic agent
D
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A This is the IgA.
B This is the IgG.
C This is not associated with elevated levels of IgM.
D An elevated level of IgM is associated with exposure to infection in utero
because IgM does not cross the placenta.
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