Below is the full, abbreviated summary of flu action here at the end of an influenza season that was a pandemic about which there was much disagreement.

Next year, CDC officials say, the seasonal influenza vaccine will include the 2010 H1N1 strain as part of the formula.

CDC

2009-2010 Influenza Season Week 20 ending May 22, 2010

This is the final report of the 2009-2010 season. The first weekly influenza surveillance report of the 2010-2011 season (week 40, week ending October 9, 2010) will be published on October 15, 2010.

All data are preliminary and may change as more reports are received.

Synopsis:

During week 20 ( May 16-22, 2010), influenza activity decreased in the U.S.

• Two (0.2%) 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.
• Both subtyped influenza A viruses were 2009 influenza A (H1N1).
• The proportion of deaths attributed to pneumonia and influenza (P&I) was below the epidemic threshold.
• Three influenza-associated pediatric deaths were reported and were associated with 2009 influenza A (H1N1) virus infection.
• The proportion of outpatient visits for influenza-like illness (ILI) was 1.0%, which is below the national baseline of 2.3%. All 10 regions reported ILI below region-specific baseline levels.
• No states reported widespread or regional influenza activity. One state reported local influenza activity. Guam, Puerto Rico, and 13 states reported sporadic influenza activity. The District of Columbia and 34 states reported no influenza activity, and the U.S. Virgin Islands and two states did not report.

Source: CDC, Flu View Report, Week 20, ending May 22, 2010