Treatment of influenza : Treatment of uncomplicated acute illness due to influenza infection in adults and children 1 year of age or older who have been symptomatic for no more than 2 days. Prophylaxis of influenza : Post exposure prevention in adults and children 1 year of age or older patients following contact with a clinically diagnosed influenza case when influenza virus is circulating in the community. The appropriate use of Tamiflu for prevention of influenza should be determined on a case by case basis by the circumstances and the population requiring protection. In exceptional situations (e.g. in case of a mismatch between the circulating and vaccine virus strains and a pandemic situation) seasonal prevention could be considered in adults and children 1 year of age or older.