Criteria | 2007 | 2008 | ||
---|---|---|---|---|
Excluded | Included | Excluded | Included | |
Inclusion | ||||
Respiratory swabs of ILI patients submitted by GPs | 0 | 480 | 0 | 407 |
Exclusion | ||||
Influenza result unknown | 0 | 480 | 0 | 407 |
Vaccination status unknown | 8 | 472 | 4 | 403 |
Symptom onset to specimen collection interval unknown | 41a | 434 | 22a | 384 |
> 4 days between symptom onset and specimen collection | 50b | 386 | 54 | 330 |