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Volume 16, Number 5—May 2010
Research

Contagious Period for Pandemic (H1N1) 2009

Gaston De SerresComments to Author , Isabelle Rouleau, Marie-Eve Hamelin, Caroline Quach, Danuta Skowronski, Louis Flamand, Nicole Boulianne, Yan Li, Julie Carbonneau, Anne-Marie Bourgault, Michel Couillard, Hugues Charest, and Guy Boivin
Author affiliations: Institut National de Santé Publique du Québec, Quebec City, Quebec, Canada (G. De Serres, I. Rouleau, N. Boulianne, A.-M. Bourgault, M. Couillard, H. Charest), Laval University, Quebec City (G. De Serres, M.-E. Hamelin, L. Flamand, J. Carbonneau, G. Boivin); McGill University–Montreal Children's Hospital, Montreal, Quebec, Canada (C. Quach); British Columbia Centers for Disease Control, Vancouver, British Columbia, Canada (D. Skowronski); Public Health Agency of Canada, Winnipeg, Manitoba, Canada (Y. Li)

Main Article

Table 1

Characteristics of various subgroups of participants in assessment of length of shedding of pandemic (H1N1) 2009 virus, Quebec City, Quebec, Canada, May 27–July 10, 2009*

Characteristic No. (%) core participants, n = 43 Symptomatic household or community contacts tested <7 days after symptom onset
Total no. (%), n = 73 No. (%) positive by pH1N1 and matrix PCRs, n = 32 No. (%) positive by matrix PCR only, 
n = 15 No. (%) negative by both PCRs, 
n = 26
Age group, y
<10 20 (47) 24 (33) 13 (41) 4 (27) 7 (27)
10–17 11 (26) 15 (21) 9 (28) 1 (7) 5 (19)
>18
12 (28)
34 (47)
10 (31)
10 (67)
14 (54)
Sex
F 24 (56) 41 (56) 17 (53) 8 (53) 16 (62)
M
19 (44)
32 (44)
15 (47)
7 (47)
10 (38)
Medical condition
Any influenza-associated 8 (19) 15 (21) 6 (19) 4 (27) 5 (19)
Pulmonary disease
4 (9)
10 (14)
3 (9)
4 (27)
3 (12)
Influenza vaccination
2008–2009 season
9 (21)
15 (21)
8 (25)
6 (40)
1 (4)
Clinical Illness†
Fever 37 (86) 37 (51) 25 (78) 8 (53) 4 (15)
Cough 42 (98) 58 (79) 31 (97) 13 (87) 14 (54)
Sore throat 26 (60) 41 (56) 19 (59) 5 (33) 17 (65)
Myalgia or arthralgia 17 (40) 23 (32) 12 (38) 4 (27) 7 (27)
Fatigue 40 (93) 51 (70) 31 (97) 10 (67) 10 (38)
Headache 31 (72 45 (62) 24 (75) 9 (60) 12 (46)
Gastrointestinal symptoms 14 (33) 18 (25) 8 (25) 5 (33) 5 (19)
Fever and cough 36 (84) 35 (48) 24 (75) 8 (53) 3 (12)
Influenza-like illness 36 (84) 34 (47) 24 (75) 8 (53) 2 (8)

*pH1N1 PCR, PCR for pandemic (H1N1) 2009 virus.
†Symptoms between onset of disease and first nasopharyngeal swab.

Main Article

Page created: December 23, 2010
Page updated: December 23, 2010
Page reviewed: December 23, 2010
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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