Research Article
Lesson Learned from the Emergence of Influenza Pandemic H1N1 in 2009 in Indonesia: The Importance of Influenza-Like Illness (ILI) Surveillance
Table 2
Case proportion, type, and subtype of seasonal influenza monthly.
| Month | No. of ILI cases | Flu B | H1N1 | H3N2 | H5N1 | H1pdm09 | Flu A not type |
| January | 87 | 10 | 3 | 5 | 0 | 0 | 8 | February | 81 | 14 | 4 | 1 | 0 | 0 | 2 | March | 103 | 18 | 6 | 0 | 0 | 0 | 2 | April | 277 | 9 | 4 | 2 | 0 | 1 | 2 | May | 345 | 8 | 4 | 2 | 0 | 0 | 0 | June | 366 | 1 | 9 | 10 | 0 | 8 | 2 | July | 474 | 0 | 10 | 9 | 0 | 83 | 16 | August | 475 | 0 | 1 | 6 | 0 | 93 | 28 | September | 212 | 0 | 0 | 3 | 0 | 1 | 12 | October | 279 | 9 | 0 | 1 | 0 | 0 | 11 | November | 277 | 4 | 0 | 1 | 0 | 1 | 3 | December | 278 | 7 | 1 | 1 | 0 | 0 | 4 |
| Total | 3254 | 80 | 42 | 41 | 0 | 187 | 89 |
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