As of 21 March 2010, worldwide more than 213 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including over 16,931 deaths.

2010 USDA National Veterinary Services Laboratories Presumptive and Confirmatory 2009 Pandemic H1N1 Influenza Test Results for Animal Samples

1918 and 2009 Pandemic Influenza Viruses Lack a Sugar Topping: Finding Could Aid Vaccine Design

Unlike seasonal influenza vaccine which typically expires on June 30th, the 2009 H1N1 monovalent influenza vaccine expiration dates range from February 2010 to early 2011.

To characterize the severity of 2009 H1N1 infection in pregnant women, the New York City Department of Health and Mental Hygiene (DOHMH) conducted active and passive surveillance for cases of 2009 H1N1 infection in pregnant women requiring intensive care.

Since mid February 2010, CDC has been working closely with its centralized vaccine distributor to prepare for a second phase of distribution of 2009 H1N1 vaccine and supplies that will take effect on April 1, 2010.

As of 14 March 2010, worldwide more than 213 countries and overseas territories or communities have reported laboratory confirmed cases of pandemic influenza H1N1 2009, including at least 16813 deaths.

CDC recommends a three-step approach to fighting influenza (flu).

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.

March 12 - WHO Updates International H1N1 Flu Situation

The January 12, 2010 National Influenza Vaccination Week Webinar featured Dr. Nicole Lurie with the US Department of Health and Human Services; Dr. Anthony Fiore with Centers for Disease Control and Prevention; Dr. Otis Webb Brawley with American Cancer Society; Christine Tobin with American Diabetes Association; and Mary Partridge with the American Lung Association.

This year's flu materials include messaging to address both Seasonal and 2009 H1N1 flu (sometimes called "swine flu") recommendations.

Trial Results in Rural Canadians Show Effect of Herd Immunity

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.

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.