Which of the antibody classes is able to cross epithelial cells and is therefore present in breast milk?
A) IgA only
B) IgM only
C) IgG only
D) both IgG and IgM
E) both IgM and IgA

Question

Quizplus · Accepted Answer

IgA, particularly secretory IgA (sIgA), is the main antibody class that can cross epithelial cells and is present in breast milk, providing passive immunity to the infant.

Which of the Antibody Classes Is Able to Cross Epithelial