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Method of diagnosis in influenza subjects according to symptom duration
| Duration (days) | IFA | Culture∗ | Serology |
|---|---|---|---|
| 0–3 | 3 /4 | 2 /4 | 1 /4 |
| 3–7 | 3 /3 | 2 /3 | 0 /3 |
| >7 | 0 /2 | 0 /2 | 2 /2 |
IFA, indirect fluorescent antibody.
Viral culture using Madin–Darby canine kidney cells.
