According to the U.S. Centers for Disease Control and Prevention (CDC), laboratory confirmed human cases of influenza A/H1N1 have occurred in the United States. Status reports are regularly updated and available on the CDC and World Health Organization (WHO) Web sites. Most cases experienced mild flu-like symptoms. All viruses have the same genetic pattern based on preliminary testing. For updated travel information see http://wwwn.cdc.gov/travel/ .
What is H1N1 Flu?
H1N1 flu is caused by type A strains of the influenza virus, and is being described as a new subtype of A/H1N1 not previously detected in swine or humans. Previous variants of H1N1 are known since 1918 with the most recent major outbreak in 1977.
How can Humans Become Infected?
Transmission of all reported cases appears to have resulted from human-to-human contact through coughing or sneezing by the infected person.
What are the Symptoms?
Those carrying the virus can reveal typical flu-like symptoms: