Table 1 Number of samples tested and percentages attributable to influenza A and B virus types in Italy, as reported to the virological surveillance system, by season (from 2004/2005 to 2016/2017)
Season | Samples tested | Influenza virus detections (%) | N. of Influenza A viruses (%) | N. of Influenza B viruses (%) | Estimated ILI cases |
|---|---|---|---|---|---|
2004/2005 | 3226 | 971 (30) | 718 (74) | 253 (26) | 6336.000 |
2005/2006 | 2719 | 307 (11) | 228 (74) | 79 (26) | 2347.000 |
2006/2007 | 1869 | 643 (34) | 607 (94) | 36 (6) | 3675.000 |
2007/2008 | 1870 | 548 (29) | 286 (52) | 262 (48) | 4692.000 |
2008/2009 | 2213 | 733 (33) | 688 (94) | 45 (6) | 4105.000 |
2009/2010 | 16,433 | 6282 (38) | 6230 (> 99) | 52 (< 1) | 5507.000 |
2010/2011 | 9193 | 2874 (31) | 2082 (72) | 792 (28) | 5917.000 |
2011/2012 | 4677 | 1672 (36) | 1610 (96) | 62 (4) | 5000.000 |
2012/2013 | 5535 | 2114 (38) | 894 (42) | 1220 (58) | 6181.000 |
2013/2014 | 4426 | 1033 (23) | 999 (97) | 34 (3) | 4542.000 |
2014/2015 | 10,299 | 3734 (36) | 3133 (84) | 601 (16) | 6299.000 |
2015/2016 | 8985 | 2457 (27) | 1044 (42) | 1413 (58) | 4877.000 |
2016/2017 | 12,034 | 3518 (29) | 3339 (95) | 179 (5) | 5440.000 |
All seasons | 83,479 | 26,886 (32.2) | 21,858 (81.3)* | 5028 (18.7)* | 64,918.000 |