Volume 16, Number 5—May 2010
Research
Contagious Period for Pandemic (H1N1) 2009
Gaston De Serres
, 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
, 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 BoivinTable 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.
