Viral neutralization testing is based on the fact that
A. antibodies can be produced against the toxin of a pathogen.
B. antibodies have different molecular weights.
C. viruses introduced into appropriate cell cultures have a cytopathic effect.
D. the gene for a pathogen's antigen can be isolated and introduced into a host cell by way of a plasmid.
E. antibodies to certain microbes can be given a fluorescent label.
Answer: C
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