| Study characteristics |
| Methods |
Authors investigated an outbreak in a nursing home in Ontario, Canada during the 1996 to 1997 influenza season. Follow‐up period was 1 January 1997 to 11 January 1997. Nasal swabs were obtained from 3 ill residents. |
| Participants |
172 nursing home residents (149 treated and 23 controls, all included in the analysis) |
| Interventions |
Parenteral influenza vaccine. Vaccine strains probably matched circulating strains (other studies). |
| Outcomes |
Clinically defined ILI (fever 38 °C or greater, cough, sore throat, nasal congestion, muscle ache, lethargy, lasting 2 days or more) |
| Notes |
Amantadine was used in all residents. 1 positive result was obtained by rapid testing. Poor reporting |
| Risk of bias |
| Bias |
Authors' judgement |
Support for judgement |
| Allocation concealment (selection bias) |
High risk |
C ‐ Inadequate |
