Volume 17, Number 9—September 2011
Research
Seroepidemiologic Study of Pandemic (H1N1) 2009 during Outbreak in Boarding School, England
Sandra Johnson, Chikwe Ihekweazu
, Pia Hardelid, Nika Raphaely, Katja Hoschler, Alison Bermingham, Muhammad Abid, Richard Pebody, Graham Bickler, John Watson, and Éamonn O’Moore
, Pia Hardelid, Nika Raphaely, Katja Hoschler, Alison Bermingham, Muhammad Abid, Richard Pebody, Graham Bickler, John Watson, and Éamonn O’MooreTable A1
Association of demographic characteristics, self-reported illness variables, and interventions with symptoms of ARI or ILI in boarding school population during outbreak of pandemic (H1N1) 2009, England*
| Demographic characteristics and interventions | No. (%)† with completed questionnaire, n = 695 | No. (%)† with completed questionnaire and matched sample, n = 353 |
|---|---|---|
| Category | ||
| Students | 469 (67.5) | 216 (61.2) |
| Staff |
226 (32.5) |
137 (38.8) |
| Age group, y | ||
| 13–15 | 219 (32.8) | 90 (25.5) |
| 16–18 | 250 (37.5) | 126 (35.7) |
| 20–49 | 111 (16.6) | 71 (20.1) |
| >50 | 87 (13.0) | 66 (18.7) |
| Unknown |
28 |
|
| Sex, staff only† | ||
| Female | 109 (48.2) | 71 (58.8) |
| Male |
117 (51.8) |
66 (48.1) |
| Role, staff only‡ | ||
| Nonteaching | 135 (61.4) | 93 (68.4) |
| Teaching | 85 (38.6) | 43 (31.6) |
| Unknown |
6 |
1 |
| Self-reported illness | ||
| ARI | ||
| No | 424 (64.1) | 199 (58.5) |
| Yes | 237 (35.9) | 141 (41.5) |
| Unknown | 34 | 13 |
| ILI, ARI plus fever | ||
| No | 551 (83.4) | 277 (81.5) |
| Yes | 110 (16.6) | 63 (18.5) |
| Unknown |
34 |
13 |
| Severity§ | ||
| Mild | 145 (62.8) | 81 (57.9) |
| Moderate and severe | 86 (37.2) | 59 (42.1) |
| Unknown |
6 |
1 |
| Duration, d§ | ||
| 1–2 | 26 (14.2) | 14 (13.1) |
| 3–7 | 88 (48.1) | 52 (48.6) |
| 7–10 | 33 (18.0) | 18 (16.8) |
| >10 | 36 (19.7) | 23 (21.5) |
| Unknown |
54 |
34 |
| Interventions | ||
| Took antiviral drugs | ||
| No | 198 (33.5) | 96 (31.7) |
| Yes | 393 (66.5) | 207 (68.3) |
| Unknown | 104 | 50 |
| Use of antiviral drugs: PEP vs. treatment doses | ||
| PEP dose only | 352 (59.6) | 187 (61.7) |
| Treatment dose | 41 (6.9) | 20 (6.6) |
| No information on dose recorded | 104 | 50 |
| Completion of PEP course of antiviral drugs¶ | ||
| No antiviral drugs | 198 (36.5) | 96 (34.3) |
| Course not completed | 51 (9.4) | 25 (8.9) |
| Course completed | 294 (54.1) | 159 (56.8) |
| No information on completion of course provided |
111 |
53 |
| Seasonal influenza vaccine | ||
| No | 216 (33.7) | 105 (31.3) |
| Yes | 425 (66.3) | 230 (68.7) |
| No information recorded | 54 | 18 |
*ARI, acute respiratory infection; ILI, influenza-like illness; PEP, postexposure prophylaxis.
†Percentage of total, excluding those categories in which the response was unknown or blank.
‡All students were male.
§Of those who self-reported ARI: n = 237 with completed questionnaire; n = 141 with completed questionnaire and matched sample.
¶Excluding those who reported taking the treatment dose of antiviral drugs: n = 654 with completed questionnaire; n = 333 with completed questionnaire and matched sample.
