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 Boivin
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.
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