Volume 15, Number 2—February 2009
Research
Oseltamivir-Resistant Influenza Viruses A (H1N1), Norway, 2007–08
Siri H. Hauge, Susanne Dudman, Katrine Borgen, Angie Lackenby, and Olav Hungnes
Table 2
Reported associations for patients infected with oseltamivir-resistant or oseltamivir-susceptible influenza virus A (H1N1), 2007–08 influenza season, Norway
| Association | Resistant, n = 183 |
Susceptible, n = 89 |
Crude associations |
Adjusted associations* |
|||||
|---|---|---|---|---|---|---|---|---|---|
| Attack rate, % | No. responses | Attack rate, % | No. responses | Risk ratio (95% CI)† | Risk ratio (95% CI) | ||||
| Sign or symptom | |||||||||
| Productive cough | 38.4 | 125 | 31.9 | 47 | 1.2 (0.8–1.9) | ||||
| Fever | 94.4 | 162 | 95.0 | 80 | 1.0 (0.9–1.1) | ||||
| Myalgia | 72.9 | 129 | 73.3 | 60 | 1.0 (0.8–1.2) | ||||
| Dry cough | 82.1 | 145 | 86.3 | 73 | 1.0 (0.8–1.1) | ||||
| Headache | 63.4 | 131 | 67.2 | 58 | 0.9 (0.8–1.2) | ||||
| Sore throat | 57.5 | 134 | 67.2 | 58 | 0.9 (0.7–1.1) | ||||
| Runny nose |
62.2 |
127 |
66.1 |
56 |
0.9 (0.8–1.2) |
||||
| Complication | |||||||||
| Pneumonia | 9.2 | 153 | 2.9 | 69 | 3.2 (0.7–13.5) | 3.2 (0.7–13.7) | |||
| Sinusitis | 6.2 | 145 | 3.0 | 67 | 2.1 (0.5–9.4) | 1.7 (0.4–7.5) | |||
| Otitis media | 4.8 | 145 | 4.4 | 69 | 1.1 (0.3–4.2) | 1.3 (0.4–4.8) | |||
| Bronchitis | 8.7 | 149 | 11.8 | 76 | 0.7 (0.3–1.7) | 0.8 (0.4–1.8) | |||
| Any |
24.4 |
164 |
22.1 |
77 |
1.1 (0.7–1.8) |
1.1 (0.7–1.8) |
|||
| Hospitalization | 15.8 | 177 | 19.5 | 87 | 0.8 (0.5–1.4) | 0.8 (0.5–1.3) | |||
*Risk ratio adjusted for age, gender, and predisposing disease.
†CI, confidence interval.
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