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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.

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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