Table 1.
U.S. Flu VE Network population characteristics, 2011–2016 (N=20,022)
| 18–49 years N = 11,131 |
50–64 years N = 5,489 |
65–74 years N = 2,174 |
>75 years N = 1,228 |
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|---|---|---|---|---|---|---|---|---|
|
| ||||||||
| n | Influenza positive (%) | n | Influenza positive % | n | Influenza positive % | n | Influenza positive % | |
|
| ||||||||
| Sex | ||||||||
| Female | 7131 | 1581 (22) | 3370 | 807 (24) | 1255 | 275 (22) | 743 | 163 (22) |
| Male | 3998 | 1040 (26) | 2118 | 578 (27) | 919 | 233 (25) | 485 | 106 (22) |
|
| ||||||||
| Race/ethnicity | ||||||||
| White, non-Hispanic | 8547 | 2058 (24) | 4477 | 1126 (25) | 1906 | 453 (24) | 1083 | 235 (22) |
| Black, non-Hispanic | 774 | 174 (22) | 385 | 104 (27) | 100 | 24 (24) | 51 | 12 (24) |
| Hispanic | 843 | 182 (22) | 258 | 63 (24) | 52 | 11 (21) | 41 | 6 (15) |
| Other, non-Hispanic | 933 | 201 (22) | 358 | 91 (25) | 108 | 19 (18) | 49 | 15 (31) |
|
| ||||||||
| High risk conditions* | ||||||||
| 0 | 8131 | 1995 (25) | 2740 | 736 (27) | 676 | 166 (25) | 198 | 41 (21) |
| ≥1 | 3000 | 627 (21) | 2749 | 650 (24) | 1498 | 342 (23) | 1030 | 228 (22) |
|
| ||||||||
| Reported general health statust† | ||||||||
| Excellent | 2680 | 765(29) | 1046 | 294 (28) | 386 | 103 (27) | 152 | 43 (28) |
| Very good | 4707 | 1116 (24) | 2117 | 555 (26) | 851 | 209 (25) | 416 | 89 (21) |
| Good | 2933 | 602 (21) | 1725 | 405 (23) | 695 | 142 (20) | 456 | 94 (21) |
| Fair | 708 | 123 (17) | 520 | 110 (21) | 211 | 45 (21) | 171 | 36 (21) |
| Poor | 95 | 14 (15) | 73 | 18 (25) | 28 | 9 (32) | 32 | 7 (22) |
|
| ||||||||
| Vaccinated for current season | ||||||||
| Yes | 4457 | 823(19) | 3251 | 659 (20) | 1652 | 358 (22) | 1019 | 210 (21) |
| No | 6674 | 1799 (27) | 2238 | 727 (32) | 522 | 150(29) | 209 | 59 (28) |
|
| ||||||||
| Time from symptom onset to enrollment | ||||||||
| <3 days | 3473 | 1131 (33) | 1374 | 528 (38) | 528 | 201 (38) | 284 | 94 (33) |
| 3–4 days | 4431 | 1049 (24) | 2198 | 551 (25) | 812 | 172 (21) | 479 | 109 (23) |
| 5–7 days | 3227 | 442 (14) | 1917 | 307 (16) | 834 | 135 (16) | 465 | 66 (14) |
|
| ||||||||
| Season | ||||||||
| 2011–12 | 1544 | 234 (15) | 674 | 94 (14) | 240 | 36 (15) | 150 | 18 (12) |
| 2012–13 | 2200 | 719 (33) | 1032 | 364 (35) | 413 | 137 (33) | 216 | 75 (35) |
| 2013–14 | 2139 | 539 (25) | 1089 | 267 (25) | 401 | 77(19) | 214 | 25 (12) |
| 2014–15 | 2804 | 633 (23) | 1495 | 378 (25) | 711 | 197 (28) | 427 | 133 (31) |
| 2015–16 | 2444 | 497 (20) | 1199 | 283 (24) | 409 | 61 (15) | 221 | 18 (8) |
|
| ||||||||
| Type and subtype | ||||||||
| Influenza A unsubtyped | – | 53 | – | 24 | – | 9 | – | 3 |
| A(H1N1)pdm09 | – | 848 | – | 459 | – | 100 | – | 31 |
| A(H3N2) | – | 1182 | – | 583 | – | 293 | – | 207 |
| Excluding 2014–15 | – | 660 | – | 302 | – | 125 | – | 90 |
| Influenza B | – | 539 | – | 320 | – | 106 | – | 28 |
*
Presence of one or more electronic medical record code for a high-risk condition in the prior year, as defined by the ACIP guidance for conditions that increase the risk of complications from influenza
†
n = 20,002 (11,123 for 18–49 years, 5,481 for 50–64 years, 2,127 for 65–74 years, and 1,227 for ≥75 years)