April 26, 2009 12:45 ET

Human cases of swine influenza A (H1N1) virus infection have been identified in the United States. Human cases of swine influenza A (H1N1) virus infection also have been identified internationally. The current U.S. case count is provided below.

U.S. Human Cases of Swine Flu Infection State # of laboratory
confirmed cases
California 7 cases
Kansas 2 cases
New York City 8 cases
Ohio 1 case
Texas 2 cases

TOTAL COUNT 20 cases



As of April 26, 2009 9:00 AM ET

Investigations are ongoing to determine the source of the infection and whether additional people have been infected with swine influenza viruses.

CDC is working very closely with officials in states where human cases of swine influenza A (H1N1) have been identified, as well as with health officials in Mexico, Canada and the World Health Organization. This includes deploying staff domestically and internationally to provide guidance and technical support. CDC has activated its Emergency Operations Center to coordinate this investigation.

Laboratory testing has found the swine influenza A (H1N1) virus susceptible to the prescription antiviral drugs oseltamivir and zanamivir and has issued interim guidance for the use of these drugs to treat and prevent infection with swine influenza viruses. CDC also has prepared interim guidance on how to care for people who are sick and interim guidance on the use of face masks in a community setting where spread of this swine flu virus has been detected. This is a rapidly evolving situation and CDC will provide new information as it becomes available.

There are everyday actions people can take to stay healthy.

* Cover your nose and mouth with a tissue when you cough or sneeze. Throw the tissue in the trash after you use it.
* Wash your hands often with soap and water, especially after you cough or sneeze. Alcohol-based hands cleaners are also effective.
* Avoid touching your eyes, nose or mouth. Germs spread that way.

Try to avoid close contact with sick people.

* Influenza is thought to spread mainly person-to-person through coughing or sneezing of infected people.
* If you get sick, CDC recommends that you stay home from work or school and limit contact with others to keep from infecting them.


International Human Cases of Swine Flu Infection

printable version
Influenza-like illness in the United States and Mexico

24 April 2009 -- The United States Government has reported seven confirmed human cases of Swine Influenza A/H1N1 in the USA (five in California and two in Texas) and nine suspect cases. All seven confirmed cases had mild Influenza-Like Illness (ILI), with only one requiring brief hospitalization. No deaths have been reported.

The Government of Mexico has reported three separate events. In the Federal District of Mexico, surveillance began picking up cases of ILI starting 18 March. The number of cases has risen steadily through April and as of 23 April there are now more than 854 cases of pneumonia from the capital. Of those, 59 have died. In San Luis Potosi, in central Mexico, 24 cases of ILI, with three deaths, have been reported. And from Mexicali, near the border with the United States, four cases of ILI, with no deaths, have been reported.

Of the Mexican cases, 18 have been laboratory confirmed in Canada as Swine Influenza A/H1N1, while 12 of those are genetically identical to the Swine Influenza A/H1N1 viruses from California.

The majority of these cases have occurred in otherwise healthy young adults. Influenza normally affects the very young and the very old, but these age groups have not been heavily affected in Mexico.

Because there are human cases associated with an animal influenza virus, and because of the geographical spread of multiple community outbreaks, plus the somewhat unusual age groups affected, these events are of high concern.

The Swine Influenza A/H1N1 viruses characterized in this outbreak have not been previously detected in pigs or humans. The viruses so far characterized have been sensitive to oseltamivir, but resistant to both amantadine and rimantadine.

The World Health Organization has been in constant contact with the health authorities in the United States, Mexico and Canada in order to better understand the risk which these ILI events pose. WHO (and PAHO) is sending missions of experts to Mexico to work with health authorities there. It is helping its Member States to increase field epidemiology activities, laboratory diagnosis and clinical management. Moreover, WHO's partners in the Global Alert and Response Network have been alerted and are ready to assist as requested by the Member States.

WHO acknowledges the United States and Mexico for their proactive reporting and their collaboration with WHO and will continue to work with Member States to further characterize the outbreak.
For more information, please contact:

Thomas Abraham
Communications in English
Mobile: +41 79 516 3136
E-mail: abrahamt@who.int

Fadela Chaib
Communications in English and French
Mobile: +41 79 475 5556
E-mail: chaibf@who.int

Sari Setiogi
Communications in English and Bahasa
Mobile: +41 79 701 9467
E-mail: setiogis@who.int

Gregory Hartl
Communications in English, French, German and Spanish
Mobile: +41 79 203 6715
E-mail: hartlg@who.int

Aphaluck Bhatiasevi
Communications in English, Thai and Hindi
Mobile: +41 79 484 2997
E-mail: bhatiaseviap@who.int