Comparisons in rotavirus neutralizing-antibody responses were made wit
h sera collected from vaccinated infants. The methods were a plaque re
duction assay and a new enzyme-linked immunosorbent assay-based neutra
lization assay. Agreement of 94% was found in detecting at least fourf
old seroresponses, and correlation coefficients between titers obtaine
d by the two methods showed excellent agreement, indicating that eithe
r could be used reliably.