Update: influenza activity--United States, December 7-13, 2003

Influenza activity in the United States continued to increase during December 7-13, 2003. The proportion of patient visits to sentinel providers for influenza-like illness (ILI) overall was 7.4%, which is above the national baseline of 2.5%. Thirty-six state health departments reported widespread influenza activity, 12 states and New York City reported regional influenza activity, one state and the District of Columbia reported local influenza activity, and one state and Puerto Rico reported sporadic influenza activity