TABLE 1.
Performances of rapid assays for influenza virus compared to those of cell culture and DFA staining for samples submitted in either sterile containers or M4 viral transport medium
| Assay or transport condition and result | INFLU A·B-Quick
|
Directigen Flu A+B
|
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Influenza A virus
|
Influenza B virus
|
Influenza A virus
|
Influenza B virus
|
||||||||||||||
| No. of specimens:
|
Sensitivity (%) | Specificity (%) | No. of specimens:
|
Sensitivity (%) | Specificity (%) | No. of specimens:
|
Sensitivity (%) | Specificity (%) | No. of specimens:
|
Sensitivity (%) | Specificity (%) | ||||||
| Positive | Negative | Positive | Negative | Positive | Negative | Positive | Negative | ||||||||||
| DFA staining and culture | |||||||||||||||||
| Positive | 23 | 19 | 54.8 | 100 | 10 | 6 | 62.5 | 99.6 | 23 | 19 | 54.8 | 100 | 9 | 7 | 56.3 | 99.6 | |
| Negative | 0 | 213 | 1 | 238 | 0 | 213 | 1 | 238 | |||||||||
| DFA staining | |||||||||||||||||
| Positive | 16 | 12 | 57.1 | 96.9 | 10 | 2 | 83.3 | 99.6 | 16 | 12 | 57.1 | 96.9 | 9 | 3 | 75 | 99.6 | |
| Negative | 7 | 220 | 1 | 242 | 7 | 220 | 1 | 242 | |||||||||
| Culture | |||||||||||||||||
| Positive | 23 | 17 | 57.5 | 100 | 10 | 5 | 66.7 | 99.6 | 23 | 17 | 57.5 | 100 | 9 | 6 | 60 | 99.6 | |
| Negative | 0 | 215 | 1 | 239 | 0 | 215 | 1 | 239 | |||||||||
| Sterile container | |||||||||||||||||
| Positive | 12 | 5 | 70.6 | 100 | 8 | 2 | 80 | 100 | 14 | 3 | 82.4 | 100 | 7 | 3 | 70 | 99.3 | |
| Negative | 0 | 138 | 0 | 145 | 0 | 138 | 1 | 144 | |||||||||
| M4 medium | |||||||||||||||||
| Positive | 11 | 14 | 44 | 100 | 2 | 4 | 33.3 | 98.9 | 9 | 16 | 36 | 100 | 2 | 4 | 33.3 | 100 | |
| Negative | 0 | 75 | 1 | 93 | 0 | 75 | 0 | 94 | |||||||||