What is seasonal influenza?
Every year, various strains of influenza virus circulate throughout the world, often causing local outbreaks. Canadians are infected by these different strains at various times during their life. Even though the virus may change slightly from year to year, most people will continue to have some protection against slightly changed viruses, particularly if they are immunized yearly. The best time to be immunized is during October and the first half of November just before the influenza season starts. Read more on how to take care of yourself or others with influenza.
