Genetic analysis of H5N1 bird flu viruses from a severely ill patient in Louisiana revealed multiple mutations that may enhance the virus’s ability to bind to human upper airway cells, the Centers for Disease Control and Prevention (CDC) reported on Thursday.

The first severe case of H5N1 bird flu was confirmed in Louisiana. Here is a map of other states that have been affected.

The United States has confirmed its first known severe human infection of H5N1 bird flu, in a person in Louisiana believed to have contracted the virus through contact with sick or dead birds in a backyard flock.

The presence of highly pathogenic avian influenza, or H5N1 bird flu, has been confirmed after officials worked to quarantine a backyard flock in Franklin County last week. HPAI was confirmed in the 24-bird flock by Vermont’s Agency of Agriculture,

Los Angeles County health officials have identified three more cats with presumptive H5N1; the source of the virus has not yet determined, but experts suspect raw meat.

Two more cases of bird flu have been found in Norfolk, taking the number of recently confirmed cases in the county to 10. The Department for Environment, Food and Rural Affairs (Defra) said following further testing the highly pathogenic avian influenza H5N1 virus had been confirmed in commercial poultry at a premises near Hingham,

"This is the first human case of H5 bird flu detected in LA County," the statement said. "The person had mild symptoms, has been treated with antivirals, and is recovering at home

Mississippi has confirmed H5N1 in a poultry flock. The birds are not part of food supply chain. What you need to know about bird flu symptoms, risk.

A chilling milestone in U.S. public health has been confirmed. The Centers for Disease Control and Prevention (CDC) recently announced the nation’s first severe case of avian

The first human-case of the bird flu has been reported in Los Angeles County. The person who caught it is believed to be recovering with mild symptoms.