Final answer:
In a neutralization assay, high numbers of antiviral antibodies in a patient's serum would result in fewer plaques.
Step-by-step explanation:
In a neutralization assay, if a patient's serum has high numbers of antiviral antibodies, we would expect to see fewer plaques. The presence of a high number of antiviral antibodies indicates that the antibodies are binding to the viral particles, preventing them from infecting host cells and forming plaques.