The ____________________ of the body acts as an effective barrier to most organisms, and very few infectious agents can penetrate it.
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Q49: The term "antibody" is also referred to
Q50: Cell-mediated immunity is conferred by activated leukocytes
Q51: An antigen is also called a(n) _.
Q51: An antigen is also called a(n) _.
Q52: The terms antibody and _ are used
Q53: A skin rash known as erythema migrans
Q55: The term "rubella" means "_."
Q56: The BCG vaccine is indicated for _.
Q58: A(n) _ is a condition in a
Q59: Children under age 10 need _ vaccines
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