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Volume 17, Number 9—September 2011

Research

Seroepidemiologic Study of Pandemic (H1N1) 2009 during Outbreak in Boarding School, England

Sandra Johnson, Chikwe IhekweazuComments to Author , Pia Hardelid, Nika Raphaely, Katja Hoschler, Alison Bermingham, Muhammad Abid, Richard G. Pebody, Graham Bickler, John Watson, and Éamonn O’Moore
Author affiliations: Author affiliations: Health Protection Agency, London, UK (S. Johnson, C. Ihekweazu, P. Hardelid, K. Hoschler, A. Bermingham, R. Pebody, G. Bickler, J. Watson); Health Protection Agency, Oxfordshire, UK (N. Raphaely, M. Abid, É. O’Moore)

Main Article

Table 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.

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