A once healthy person who now has a weakened immune system and suffers from repeated opportunistic infections probably has ____________________.
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Q60: Live microbes are used in some vaccines;
Q61: The smallpox vaccine was introduced by _.
Q62: The newer DPT vaccine is called _.
Q63: Immunotherapy with animal sera is hazardous because
Q64: Three properties are essential for a vaccine;
Q66: The "active" component in tetanus antitoxin is
Q67: A newborn receives maternal antibodies from its
Q68: Name the congenital condition in which individuals
Q69: What are the two pathways of blood
Q70: B cells that are producing antibody molecules
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