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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 2

PCR and virus culture positivity on days 8 and 11 of illness, by age group, Quebec City, Quebec, Canada, May 27–July 10, 2009

Time after illness onset Age group, no. (%)
Total no. (%) p value
0–9 y 10–17 y >18 y
Day 8 of illness (2nd swab) n = 20 n = 11 n = 12 n = 43
pH1N1 PCR–positive specimen 10/20 (50) 3/11 (27) 5/12 (42) 18/43 (42) 0.43
Culture positive on pH1N1 PCR–positive specimen 5/10 (50) 1/3 (33) 2/5 (40) 8/18 (44) 1.00
Matrix PCR positive 5/10 (50) 6/8 (75) 3/7 (43) 14/25 (56) 0.53
Culture positive on matrix PCR–positive specimen 0/5 0/6 0/3 0/14
Any PCR positive 15/20 (75) 9/11 (82) 8/12 (67) 32/43 (74) 0.82
Culture positive on any PCR–positive specimen
5/15 (33)
1/9 (11)
2/8 (25)
8/32 (25)
0.51
Day 11 of illness (3rd swab) n = 8 n = 3 n = 5 n = 16
pH1N1 PCR–positive specimen 3/8 (38) 0/3 1/5 (20) 4/16 (25) 0.77
Culture positive on pH1N1 PCR–positive specimen 0/3 0/0 0/1 0/4
Matrix PCR–positive specimen 4/5 (80) 3/3 (100) 3/4 (75) 10/12 (83) 1.00
Culture positive on matrix PCR positive–specimen 0/4 0/3 0/3 0/10
Any PCR positive–specimen 7/8 (88) 3/3 (100) 4/5 (80) 14/16 (88) 1.00
Culture positive on any PCR positive–specimen 0/7 0/3 0/4 0/14

*pH1N1 PCR, PCR for pandemic (H1N1) 2009 virus.

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