Tamiflu anvendt som middel til forebyggelse af influenza blev undersøgt hos patienter, der havde været udsat for smitte fra et familiemedlem med influenza (962 tilfælde) eller under en epidemi (1 562 patienter i alderen 16 til 65 år, og 548 ældre patienter på plejehjem).
In the prevention of flu, Tamiflu was studied in patients who had been exposed to the disease when one of their family members contracted flu (962 cases) or during an epidemic (1,562 subjects aged between 16 and 65 years, and 548 elderly subjects in nursing homes).