Table 1.
Frequency distribution of influenza-like illness and influenza cases by the influenza type and year of occurrence in Iran
| Year | ILI cases (N = 53,526) n (%) | Influenza cases by type | n (%)a |
|---|---|---|---|
| 2010 | 7062 (13.0) | Type A | 257 (45) |
| Type B | 310 (55) | ||
| Negative ILI cases | 6495 | ||
| 2011 | 10,055 (19.0) | Type A | 1102 (55) |
| Type B | 900 (45) | ||
| Negative ILI cases | 8053 | ||
| 2012 | 4353 (8.0) | Type A | 473 (80) |
| Type B | 120 (20) | ||
| Negative ILI cases | 3760 | ||
| 2013 | 8321 (15.5) | Type A | 289 (70) |
| Type B | 126 (30) | ||
| Negative ILI cases | 7906 | ||
| 2014 | 6719 (12.5) | Type A | 419 (61) |
| Type B | 263 (39) | ||
| Negative ILI cases | 6037 | ||
| 2015 | 17,016 (32.0) | Type A | 2957 (86) |
| Type B | 468 (14) | ||
| Negative ILI cases | 13,591 |
a
Percentage was calculated for the positive cases of ILI; ILI, influenza-like illness.