Table 2.
Incidence of Influenza-like Illness and Laboratory-Confirmed Influenza Study Site and Year, Peru Influenza Cohort Study, 2009–2015a
| Incidence | Study Site | ||||
|---|---|---|---|---|---|
| Lima | Cuzco | Tumbes | Puerto Maldonado | Total | |
| Influenza-like illness per 1000 PY (95% CI) | |||||
| 2009 | 524 (478–575) | 194 (164–231) | 615 (561–674) | 294 (258–335) | 415 (393–439) |
| 2010 | 407 (378–440) | 353 (324–383) | 481 (449–516) | 387 (357–419) | 408 (392–424) |
| 2011 | 256 (232–282) | 281 (256–309) | 261 (237–287) | 238 (215–265) | 260 (247–273) |
| 2012 | 479 (447–514) | 332 (305–362) | 336 (310–365) | 396 (365–430) | 386 (371–401) |
| 2013 | 509 (475–544) | 498 (464–535) | 341 (314–370) | 510 (472–550) | 460 (443–477) |
| 2014 | 359 (331–390) | 437 (405–472) | 344 (308–383) | 478 (437–523) | 404 (387–422) |
| 2015 | 275 (241–314) | 411 (368–458) | … | 426 (373–486) | 363 (338–389) |
| 2009–2015a | 404 (392–417) | 369 (356–381) | 376 (363–389) | 387 (374–401) | 384 (378–391) |
| Influenza A and B per 1000 PY (95% CI) | |||||
| 2009 | 216 (187–250) | 30 (19–46) | 238 (205–276) | 109 (88–136) | 153 (140–168) |
| 2010 | 140 (123–159) | 114 (98–132) | 162 (143–183) | 124 (107–143) | 135 (126–145) |
| 2011 | 26 (19–36) | 65 (53–78) | 26 (19–35) | 59 (47–73) | 43 (39–49) |
| 2012 | 114 (99–131) | 63 (52–77) | 121 (106–139) | 122 (105–141) | 105 (97–113) |
| 2013 | 128 (112–147) | 91 (77–107) | 82 (70–97) | 84 (70–102) | 97 (90–105) |
| 2014 | 63 (49–82) | 73 (58–93) | 77 (61–97) | 99 (78–126) | 77 (68–86) |
| 2015 | 72 (55–93) | 116 (94–142) | … | 118 (92–152) | 99 (87–114) |
| 2009–2015a | 107 (101–114) | 83 (77–89) | 108 (101–115) | 104 (97–111) | 100 (97–104) |
| Medically attended influenza per 1000 PY (95% CI)b | 52 (48–57) | 29 (26–32) | 61 (56–66) | 34 (30–38) | 44 (42–46) |
| Influenza-associated hospitalizations per 1000 PY (95% CI) | 0.2 (.03–.7) | 0.9 (.4–1.6) | 0.4 (.1–1.0) | 1.4 (.7–2.4) | 0.7 (.4–1.0) |
| Health system utilization, % (95% CI)b | 49 (39–58) | 35 (26–46) | 56 (47–65) | 33 (25–43) | 44 (35–54) |
| Influenza vaccinations per 100 PY (95% CI)c | 10 (9·4–11) | 7 (6–8) | 16 (15–17) | 7 (6–8) | 10 (9.7–10.6) |
Person-years: All sites: (35353), 2009 (3020), 2010 (6352), 2011 (6243), 2012 (6394), 2013 (6217), 2014 (5045), 2015 (2082). Lima: 2009 (847), 2010 (1644), 2011 (1568), 2012 (1652), 2013 (1651), 2014 (1558), 2015 (796). Cuzco: 2009 (674), 2010 (1571), 2011 (1596), 2012 (1583), 2013 (1557), 2014 (1523), 2015 (770). Tumbes: 2009 (740), 2010 (1625), 2011 (1645), 2012 (1702), 2013 (1713), 2014 (949). Puerto Maldonado: 2009 (759), 2010 (1512), 2011 (1434), 2012 (1458), 2013 (1295), 2014 (1014), 2015 (517).
Abbreviations: CI, confidence interval; PY, person-years.
aJune 2009 through July 2015 for Lima, Cuzco, and Puerto Maldonado and June 2009 through July 2014 for Tumbes.
bHealth system utilization: ratio of the medically attended influenza episodes over total cases of influenza (B /A) × 100.
cComplete years from 2011 to 2014 for Lima and Cuzco, 2011 to 2013 for Tumbes, and 2012 to 2014 for Puerto Maldonado.