Serum from guinea pigs injected with less than a lethal dose of diphtheria toxin
A) contains a factor that protects other guinea pigs from a lethal dose of the same toxin.
B) contains a factor that protects other guinea pigs from a lethal dose of diphtheria toxin and a toxin from a different bacterium.
C) contains a factor that protects other guinea pigs from a lethal dose of toxin from a different strain of diphtheria-causing bacteria.
D) conveys active immunity to guinea pigs injected with it.
E) conveys cellular immunity to guinea pigs injected with it.
Correct Answer:
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