From the CDC:
During week 51 (December 14-20, 2008), a low level of influenza activity was reported in the United States.
- One hundred three (3.4%) specimens tested by U.S. World Health Organization (WHO) and National Respiratory and Enteric Virus Surveillance System (NREVSS) collaborating laboratories and reported to CDC/Influenza Division were positive for influenza.
- The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.
- The proportion of outpatient visits for influenza-like illness (ILI) was below national and region-specific baseline levels.
- Two states reported regional activity; six states reported local influenza activity; Puerto Rico and 36 states reported sporadic influenza activity; five states reported no influenza activity; and the District of Columbia and one state did not report.
In case you wondered what that looks like, in graph form: