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Volume 16, Number 12—December 2010
Dispatch

Pandemic (H1N1) 2009 Outbreak at Canadian Forces Cadet Camp

Rhonda Y. KroppComments to Author , Laura E. Bogaert, Robert Barber, Francois-William Tremblay, Robert Ennis, Martin Tepper, Robert Pless, Nathalie Bastien, Yan Li, Carole Beaudoin, James Anderson, Louise Pelletier, and Rachel Rodin
Author affiliations: Author affiliations: Public Health Agency of Canada, Ottawa, Ontario, Canada (R.Y. Kropp, F-W. Tremblay, R. Pless, L. Pelletier, R. Rodin); Department of National Defence Headquarters, Ottawa (L.E. Bogaert, R. Barber, R. Ennis, M. Tepper, J. Anderson); Public Health Agency of Canada, Winnipeg, Manitoba, Canada (N. Bastien, Y. Li, C. Beaudoin)

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Table 2

Frequency of reported symptoms of pandemic (H1N1) 2009 infection, Army Cadet Summer Training Centre Argonaut at Canadian Forces Base, Gagetown, New Brunswick, Canada, 2009*

Symptoms No. persons reporting symptom/no. persons reporting (%)
OR (95% CI)‡
All participants, n = 165 Persons with confirmed/ suspected cases,† n = 80 Controls, n = 85
None
28/165 (17.0)
1/80 (1.3)
27/85 (31.8)

Systemic
Fever 56/164 (34.1) 55/80 (68.8) 1/84 (1.2)
Chills 44/165 (26.7) 41/80 (51.2) 3/85 (3.5)
Headache 58/165 (35.2) 39/80 (48.8) 19/85 (22.4) 3.3 (1.7–6.5)§
Prostration 52/164 (31.7) 37/79 (46.8) 15/85 (17.6) 4.1 (2.0–8.4)¶
Malaise 67/165 (40.6) 47/80 (58.8) 20/85 (23.5) 4.6 (2.4–9.0)¶
Arthralgia 19/165 (11.5) 13/80 (16.2) 6/85 (7.1) 2.6 (0.9–7.1)
Myalgia
26/165 (15.8)
20/80 (25.0)
6/85 (7.1)
4.4 (1.7–11.6)§
Lower respiratory
Cough 97/165 (58.8) 76/80 (95.0) 21/85 (24.7)
Sputum production 33/164 (20.1) 26/79 (32.9) 7/85 (8.2) 5.5 (2.2–13.5)¶
Shortness of breath 30/165 (18.2) 26/80 (32.5) 4/85 (4.7) 9.8 (3.2–29.5)¶
Chest pain
14/165 (8.5)
13/80 (16.2)
1/85 (1.2)
16.3 (2.1–127.8)§
Upper respiratory
Sore throat 76/164 (46.3) 56/80 (70.0) 20/84 (23.8)
Nasal congestion 76/164 (46.3) 55/79 (69.6) 21/85 (24.7)
Sneezing 27/164 (16.5) 20/79 (25.3) 7/85 (8.2) 3.8 (1.5–9.5)§
Runny nose 41/159 (25.8) 32/75 (42.7) 9/84 (10.7) 6.2 (2.7–14.2)¶
Nosebleeds
10/165 (6.1)
9/80 (11.2)
1/85 (1.2)
10.6 (1.3–86.1)#
Gastrointestinal
Nausea 50/165 (30.3) 42/80 (52.5) 8/85 (9.4)
Abdominal pain 28/165 (17.0) 17/80 (21.2) 11/85 (12.9) 1.8 (0.8–4.2)
Diarrhea 26/165 (15.8) 19/80 (23.8) 7/85 (8.2) 3.5 (1.4–8.8)#
Vomiting
24/165 (14.5)
20/80 (25.0)
4/85 (4.7)
6.8 (2.2–20.8)¶
Neurologic
Seizures 0/164 (0.0) 0/80 (0.0) 0/85 (0.0) NA
Change in awareness
29/165 (17.6)
25/80 (31.2)
4/85 (4.7)
9.2 (3.0–27.9)¶
Other
Conjunctivitis 2/164 (1.2) 1/79 (1.3) 1/85 (1.2) 1.0 (0.1–17.5)
Other**
16/165 (9.7)
14/80 (17.5)
2/85 (2.4)
8.8 (2.0–40.1)§
Mean no. symptoms 6.5 8.7 3.4

*One person reported no symptoms but was PCR and culture positive. OR, odds ratio; CI, confidence interval; NA, not applicable.
†Fever and nausea reported by a greater proportion of cases than suspected cases (p<0.001 and p = 0.02, respectively). Cases and suspect cases did not differ significantly in frequency of symptoms not in the case definition or median number of symptoms and have therefore been combined here.
‡Odds ratios were not calculated for symptoms included in the case definition (fever, chills, cough, sore throat, congestion, nausea).
§p<0.01.
¶p<0.001.
#p<0.05.
**Other symptoms reported: bilateral ear infection, bruising, ear pain, ear popping, eye pain, hot flashes, jaw pain, loss of appetite, loss of voice, rib pain, swelling of eyes, swollen tonsils, toothache (1 person each); dizziness (3 persons). All persons who reported symptoms in this category had >1 other reported symptom.

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Page created: August 28, 2011
Page updated: August 28, 2011
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The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
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