This is the final report of the 2009-2010 season. During week 20 ( May 16-22, 2010), influenza activity decreased in the U.S

During week 19 ( May 9 – 15, 2010), influenza activity decreased in the U.S. 14 (0.9%) 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.

This document provides guidance to help prevent and control the spread of influenza (flu), including 2009 H1N1 flu, among campers and camp staff during the 2010 summer camp season. This guidance updates the earlier camp guidance on “novel influenza A (H1N1 flu) virus” that was issued on June 14, 2009.

During week 17 (April 24 – May 1, 2010), influenza activity decreased in the U.S. 16 (0.9%) specimens tested by U.S.

CDC is updating the Interim Guidance on Infection Control Measures for 2009 H1N1 Influenza in Healthcare Settings, Including Protection of Healthcare Personnel. Circumstances have changed significantly with respect to availability of a safe and effective vaccine, and in terms of what we know about the health impact of the novel H1N1 influenza strain. The guidance is being updated to reflect newer information.

During week 16 (April 18-24, 2010), influenza activity decreased in the U.S.16 (1.2%) 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.

This document provides updated information on pregnancy as a risk factor for serious 2009 H1N1-related complications based on findings from a recent study.

CDC has again updated its estimates of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009.

During week 14 (April 4-10, 2010), influenza activity decreased in the U.S. 52 (2.7%) specimens tested by U.S.

As of April 16, 2010, the Aggregate Hospitalizations and Deaths Reporting Activity (AHDRA) has concluded for the 2009-2010 flu season. The AHDRA surveillance system was created specifically in response to the 2009 H1N1 pandemic, and the system will be maintained for quick implementation in the event of another flu pandemic. CDC will continue to track hospitalizations and deaths through its traditional seasonal flu surveillance systems during the 2010-2011 season