Spectrum bias was present, inasmuch as RADT sensitivity increased with Centor scores, ie, 47% sensitivity among children with 0 Centor criteria, 65% among those with 1 criterion, 82% among those with 2 criteria, and 90% among those with 3 or 4 criteria.<br><b>CONCLUSIONS</b>: The sensitivity of RADT for GABHS pharyngitis is not a fixed value but varies with the severity of disease.