Which of the following is not a required characteristic of antigens from microbial pathogens that might be used in vaccine production?
A. It must be found in all strains of the pathogen.
B. It must be excreted or found on the surface of the pathogen.
C. It must be essential for the survival of the pathogen in the host.
D. All of the choices are correct.
Answer: D
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a. true b. false