Characteristics of long-term care facilities (LTCF) and influenza outbreaks, Alberta, Canada, 2013/2014 and 2014/2015 influenza seasons
| Characteristics (N=127) | %, Range, mean (SE) | 95% CI |
|---|---|---|
| Number of residents in each LTCF | ||
| Range | 9–437 | − |
| Average | 92.92 (6.28) | 80.49 to 105.36 |
| Location (%) | ||
| Major urban centre | 69.29 | − |
| Other | 30.71 | − |
| Year of outbreak (%) | ||
| 2013–2014 | 14.17 | − |
| 2014–2015 | 85.83 | |
| Primary strain (%) | ||
| Influenza A | 79.53 | − |
| Influenza B | 20.47 | − |
| Mixed strain (%) | ||
| Single | 78.74 | − |
| Mixed | 21.26 | − |
| Duration of an outbreak (T4–T1: days) | ||
| Range | 8–44 | − |
| Average | 17.18 (0.51) | 16.96 to 18.98 |
| Outbreak progression time (T2–T1: days) | ||
| Range | 0–16 | − |
| Average | 3.80 (0.26) | 3.28 to 4.33 |
| Prevalence of ILI during outbreak progression per 100 residents | ||
| 6.95 (0.87) | 5.22 to 8.67 | |
| Oseltamivir IP decision-making time (T3–T2: days) | ||
| Range | 0–13 | − |
| Average | 1.81 (0.16) | 1.49 to 2.13 |
| Postintervention duration of an outbreak (T4–T3: days) | ||
| Range | 3–28 | − |
| Average | 12.35 (0.43) | 11.50 to 13.21 |
| Overall risk of ILI during an outbreak per 100 residents | ||
| 16.24 (1.67) | 12.93 to 19.51 | |
| Overall risk of hospitalisation during an outbreak per 100 residents | ||
| 1.05 (0.29) | 0.52 to 1.62 | |
ILI, influenza-like illness; IP, influenza prophylaxis.