INFLUENZA is one of several diseases causing fever and respiratory symptoms that might raise suspicions of SARS. Its resemblance to SARS (Severe Acute Respiratory Syndrome) has raised concerns as a recurrence of SARS during the influenza season cannot be ruled out.
However, influenza itself is of particular concern because of the potential for institutional and community outbreaks and regional epidemics. Influenza typically infects 10% to 20% of the total population during seasonal epidemics, resulting in three to five million cases of severe illness and at least 250,000 to 500,000 deaths each year worldwide.