INFLUENZA activity in the United States has continued to decline since mid-January 1997. The predominant viruses have been influenza type A (H3N2), although the proportion of influenza B isolates has increased since the week ending January 18. This report summarizes influenza activity in the United States from September 29, 1996, through the week ending February 15, 1997.
The proportion of patients who visited 120 U.S. sentinel physicians for influenza-like illness (ILI) peaked at 7% from mid-December through the first week of January and was 3% of total visits by the week ending February 15, 1997. The proportion of visits for ILI had remained at or below the baseline level of 3% since the week ending January 25,1997; however, the proportion of ILI visits had not yet reached baseline levels in the West South Central and Pacific regions through the week ending February 15, 1997.
Update: Influenza Activity— United States, 1996-97 Season. JAMA. 1997;277(11):877. doi:10.1001/jama.1997.03540350027013