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 1
Proportion of oseltamivir-resistant and oseltamivir-susceptible influenza viruses A (H1N1), 2007–08 influenza season, Norway
| Sample source | Total no. samples | No. (%) resistant samples | No. (%) susceptible samples |
|---|---|---|---|
| All |
272 |
183 (67.3) |
89 (32.7) |
| Type of practice | |||
| Sentinel | 56 | 38 (67.8) | 18 (32.1) |
| Nonsentinel |
216 |
145 (67.1) |
71 (32.9) |
| Patient gender | |||
| Male | 132 | 85 (64.4) | 47 (35.6) |
| Female |
140 |
98 (70.0) |
42 (30.0) |
| Patient age group, y | |||
| 0–4 | 45 | 27 (60.0) | 18 (40.0) |
| 5–14 | 45 | 25 (55.6) | 20 (44.4) |
| 15–24 | 31 | 20 (64.5) | 11 (35.5) |
| 25–59 | 138 | 102 (73.9) | 36 (26.1) |
| 60–99 |
13 |
9 (69.2) |
4 (30.8) |
| Patient with predisposing disease | |||
| Diabetes | 10 | 9 (90.0) | 1 (10.0) |
| Lung disease | 11 | 8 (72.7) | 3 (27.3) |
| Cardiac disease | 5 | 2 (40.0) | 3 (60.0) |
| Immunodeficiency | 5 | 3 (60.0) | 2 (40.0) |
| Any | 27 | 20 (74.1) | 7 (25.9) |
