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Direct NP assay agreement compared to modified CDC assay in matched NP swab specimens. One sample was deemed invalid and was not considered for agreement calculations.
| CDC assay |
|||
|---|---|---|---|
| Positive | Negative | ||
| Direct NP | Positive | 37 | 0 |
| Negative | 3 | 32 | |
| Total | 40 | 33 | |
| PPA = 92.5% (37/40) | NPA = 97% (32/33) | ||
