Although flu activity has declined in recent weeks, 2009 H1N1 Influenza viruses continue to spread in the United States and abroad, causing illness, hospitalizations and even deaths.

As of 28 February 2010, worldwide more than 213 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 16455 deaths.

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

Estimating the number of individual flu cases in the United States is very challenging because many people with flu don't seek medical care and only a small number of those that do seek care are tested.

The U.S. Food and Drug Administration today issued final guidance to help manufacturers who are developing safe and effective cell-based viral vaccines to address emerging and pandemic threats.

On February 24, 2010, the ACIP voted on updated recommendations for use of trivalent seasonal influenza vaccine for the 2010-2011 influenza season.

As of 21 February 2010, worldwide more than 213 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 16226 deaths.

This page provides summary information about the impact of 2009 H1N1 across racial and ethnic groups in the United States.

A panel of immunization experts voted today (February 24, 2010) to expand the recommendation for annual influenza vaccination to include all people aged 6 months and older.

The Behavioral Risk Factor Surveillance System (BRFSS) is a state-based system of health surveys that collects information on health risk behaviors, preventive health practices, and health care access primarily related to chronic disease and injury.

Key FDA Advisory Committee Recommends Inclusion of 2009 H1N1 Strain in the 2010-2011 Seasonal Influenza Vaccine

Inventory capacity at CDC's centralized distribution depots (McKesson) has been at 30 million doses of 2009 H1N1 vaccine (with comparable inventory capacity for ancillary supplies) since the program's inception.

It is recommended that the following viruses be used for influenza vaccines in the 2010-2011 influenza season (northern hemisphere)

As of 14 February 2010, worldwide more than 212 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 15921 deaths.

As of 7 February 2010, worldwide more than 212 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 15292 deaths.

Since April 2009, the 2009 H1N1 influenza virus has been spreading from person-to-person worldwide, affecting all racial and ethnic groups.

With the emergence of the 2009 pandemic H1N1 influenza (pH1N1), the importance of the primary care provider's (PCP) role in the community healthcare system has become increasingly evident.

As of 31 January 2010, worldwide more than 209 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 15174 deaths.

Why are some of the doses of H1N1 vaccine manufactured in pre-filled syringes being recalled from the market?

During week 4 (January 24-30, 2010), influenza activity remained at approximately the same levels as last week in the U.S.