Passive immunity may be passed from a mother to a child.
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Q53: Acquired immunity may be from natural or
Q54: An antibody responds to a specific antigen.
Q55: Vaccines and toxoids provide artificial active immunity.
Q56: Patients should be skin-tested for hypersensitivity before
Q57: T cells directly attack invading antigens.
Q59: If a person has a very mild
Q60: With toxoids, bacterial toxins are not changed
Q61: The risks of vaccines are less than
Q62: Antitoxins are used for long-term effects against
Q63: Clinical trials show that neurological and developmental
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