This document provides updated information on obesity and morbid obesity as risk factors for serious 2009 H1N1-related complications based on findings from recent studies.

CDC has again updated its estimates of the total number of 2009 H1N1 cases, hospitalizations and deaths in the United States since April, 2009. The new estimates incorporate an additional four weeks of flu data from the previous estimates released on February 12, 2010.

During week 9 (February 28 – March 6, 2010), influenza activity remained at approximately the same levels as last week in the U.S.

FluView reports that for the week of February 21 – February 27, 2010, flu activity in the United States was relatively low, with most flu continuing to be caused by 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but is expected to continue for weeks

This is a letter developed jointly by the American College Health Association (ACHA) and CDC intended for distribution to colleges and universities across the country prior to Spring Break. The message to students is: Don’t let influenza spoil your plans for Spring Break. Take the opportunity to get vaccinated before leaving for Spring Break and protect yourself, friends and family against 2009 H1N1 flu.

During week 8 (February 21-27, 2010), influenza activity remained at approximately the same levels as last week in the U.S. 263 (6.4%) 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.

FluView reports that for the week of February 21 – February 27, 2010, flu activity in the United States was relatively low, with most flu continuing to be caused by 2009 H1N1. Flu activity, caused by either 2009 H1N1 or seasonal flu viruses, may rise and fall, but is expected to continue for weeks.

Graphical representations of CDC’s latest estimates for 2009 H1N1 cases, hospitalizations and deaths.

A magnitude 8.8 earthquake was recorded early Saturday morning off the coast of Chile. More complete information is available from the USGS.

During week 7 (February 14-20, 2010), influenza activity remained at approximately the same levels as last week in the U.S. 185 (4.4%) specimens tested by U.S