Weekly distribution of cases of sickness absence episodes due to influenza and influenza + influenza-related illness, 2007–2009 and 2010 (January–March) in Catalonia
| Week | Influenza | Influenza + influenza-related illness | |||||||||
| Epidemic period | Pandemic period | Epidemic period | Pandemic period | ||||||||
| 1 January 2007–30 September 2009 | 1 October 2009–31 March 2010 | 1 January 2007–30 September 2009 | 1 October 2009–31 March 2010 | ||||||||
| Maximum | Minimum | Median | Cases | EEI (95% CI) | Maximum | Minimum | Median | Cases | EEI (95% CI) | ||
| October | 40 | 309 | 275 | 292 | 1376 | 4.71 (3.98 to 5.58) | 5992 | 4609 | 5300.5 | 5935 | 1.12 (0.78 to 1.61) |
| 41 | 308 | 208 | 258 | 1095 | 4.24 (2.47 to 7.29) | 5544 | 3301 | 4422.5 | 4562 | 1.03 (0.51 to 2.08) | |
| 42 | 397 | 233 | 315 | 1896 | 6.02 (2.92 to 12.40) | 5145 | 4193 | 4669 | 7534 | 1.61 (1.22 to 2.14) | |
| 43 | 433 | 234 | 333.5 | 2552 | 7.65 (3.34 to 17.51) | 5301 | 3554 | 4427.5 | 7685 | 1.74 (1.00 to 3.00) | |
| November | 44 | 296 | 276 | 286 | 4906 | 17.15 (15.51 to 18.97) | 3911 | 3263 | 3587 | 11221 | 3.13 (2.43 to 4.02) |
| 45 | 480 | 301 | 390.5 | 7439 | 19.05 (10.09 to 35.97) | 5884 | 4438 | 5161 | 14911 | 2.89 (1.96 to 4.26) | |
| 46 | 592 | 327 | 459.5 | 9645 | 20.99 (9.44 to 46.69) | 6049 | 4669 | 5359 | 16780 | 3.13 (2.19 to 4.48) | |
| 47 | 679 | 343 | 511 | 7061 | 13.82 (5.55 to 34.38) | 6528 | 5008 | 5768 | 12864 | 2.23 (1.55 to 3.21) | |
| 48 | 636 | 446 | 541 | 4070 | 7.52 (4.62 to 12.25) | 6008 | 5162 | 5585 | 9056 | 1.62 (1.31 to 2.00) | |
| December | 49 | 422 | 314 | 368 | 1829 | 4.97 (3.30 to 7.48) | 3805 | 3514 | 3659.5 | 4946 | 1.35 (1.21 to 1.51) |
| 50 | 993 | 805 | 899 | 2066 | 2.30 (1.71 to 3.08) | 7682 | 6731 | 7206.5 | 6682 | 0.93 (0.77 to 1.12) | |
| 51 | 1585 | 862 | 1223.5 | 1067 | 0.87 (0.38 to 1.98) | 8803 | 5410 | 7106.5 | 4528 | 0.64 (0.33 to 1.24) | |
| 52 | 1140 | 1106 | 1123 | 399 | 0.36 (0.32 to 0.40) | 5161 | 4459 | 4810 | 2264 | 0.47 (0.38 to 0.58) | |
| January | 1 | 4460 | 1958 | 2264 | 720 | 0.32 (0.13 to 0.80) | 16790 | 8041 | 8650 | 4299 | 0.50 (0.21 to 1.17) |
| 2 | 4683 | 3149 | 3801 | 834 | 0.22 (0.15 to 0.33) | 13241 | 11918 | 12947 | 5873 | 0.45 (0.41 to 0.51) | |
| 3 | 4025 | 2338 | 3303 | 542 | 0.16 (0.10 to 0.28) | 11504 | 8781 | 11391 | 4089 | 0.36 (0.27 to 0.48) | |
| 4 | 4123 | 1751 | 3417 | 473 | 0.14 (0.06 to 0.30) | 12210 | 7477 | 10360 | 3931 | 0.38 (0.24 to 0.61) | |
| 5 | 5313 | 1602 | 2383 | 401 | 0.17 (0.05 to 0.58) | 13978 | 7832 | 8182 | 4098 | 0.50 (0.25 to 0.99) | |
| February | 6 | 4674 | 1540 | 1770 | 350 | 0.20 (0.05 to 0.72) | 12451 | 6445 | 8718 | 4030 | 0.46 (0.24 to 0.88) |
| 7 | 3048 | 1150 | 1811 | 338 | 0.19 (0.07 to 0.48) | 9142 | 5728 | 9103 | 4295 | 0.47 (0.29 to 0.76) | |
| 8 | 2011 | 879 | 1545 | 259 | 0.17 (0.08 to 0.36) | 8653 | 5304 | 7355 | 3693 | 0.50 (0.31 to 0.80) | |
| 9 | 1282 | 806 | 1125 | 201 | 0.18 (0.11 to 0.28) | 7022 | 5629 | 5642 | 3408 | 0.60 (0.47 to 0.78) | |
| March | 10 | 934 | 663 | 931 | 248 | 0.27 (0.18 to 0.39) | 7029 | 4973 | 5332 | 4091 | 0.77 (0.53 to 1.11) |
| 11 | 761 | 462 | 636 | 200 | 0.31 (0.19 to 0.52) | 5488 | 4549 | 5035 | 3718 | 0.74 (0.61 to 0.89) | |
| 12 | 764 | 156 | 354 | 164 | 0.46 (0.11 to 1.95) | 5766 | 1851 | 4272 | 3344 | 0.78 (0.29 to 2.08) | |
| 13 | 841 | 346 | 561 | 61 | 0.11 (0.05 to 0.26) | 6953 | 4254 | 5669 | 1637 | 0.29 (0.18 to 0.46) | |
Endemic-epidemic indices (EEI) and corresponding 95% CIs during the epidemic and pandemic periods are shown.