<qa>  What is the sensitivity of most of the RADTs?The great majority of the RADTs that are currently available have an excellent specificity of 95, compared with blood agar plate culture. This means that false-positive test results are unusual, and, therefore, therapeutic decisions can be made with confidence on the basis of a positive test result. Unfortunately, the sensitivity of most of these tests is 80-90, or even lower, compared with blood agar plate culture. It has been suggested that most of the false-negative RADT results occur for patients who are merely Streptococcus carriers and are not truly infected. However, early studies of first-generation RADTs demonstrated that a large proportion of patients with false-negative RADT results were truly infected with group A b-hemolytic streptococci and were not merely carriers.8 