National estimates of ambulatory medical care visits with a diagnosis of influenza and the antiviral prescription by influenza season, high adamantane resistance period, and announcement of 2006 CDC guidelines in the United States, 2002–2006.

*<p>NA: Not applicable due to the sample size of interest in the surveys was less than 30, as the estimate is considered unreliable under NAMCS and NHAMCS analysis recommendations.</p>