TABLE 6.
Virus isolation | No. IFA (% total cases)
|
||
---|---|---|---|
Negative | Positive | Total | |
Negative | 223 (73.1) | 32 (10.5) | 255 (83.6) |
Positive | 15 (4.9) | 35 (11.5) | 50 (16.4) |
Total | 238 (78.0) | 67 (22.0) | 305 (100) |
Sensitivity (95% CI), 70% (range, 57 to 81%); specificity (95% CI), 88% (range 85 to 90%); positive predictive value (95% CI), 52% (range 43 to 60%); negative predictive value (95% CI), 94% (range 91 to 96%).