"Seven of the 557 fecal samples, including 2 samples that tested equivocal by EIA and 5 samples that contained RT-PCR inhibitors, were removed from the study (data not shown).Diagnostic accuracy of the EIA. The sensitivity and specificity of the IDEIA Norovirus kit ranged from 57.4% to 77.8% and 79.7% to 91.9%, respectively, when the results were compared by different reference standards." . . . .