The U.S. Centers for Disease Control and Prevention said on Thursday its analysis of samples from the first severe case of bird flu in the country last week showed mutations not seen in samples from an infected backyard flock on the patient's property.

H5N1 usually spreads to people through contact with infected or dead birds, as with the Louisiana patient. Currently, there are no known cases of human-to-human transmission, said the CDC's Dr. Demetre Daskalakis.

The first severe case of bird flu in the US includes unique mutations, as per CDC. These mutations, found in the patient's respiratory sample, are rar

A patient in Louisiana has been hospitalized with a severe case of H5N1 bird flu, the US Centers for Disease Control and Prevention said, the first such case in the United States.

A person in Louisiana has the first severe illness caused by bird flu in the U.S., health officials said Wednesday.

The bird flu is in Louisiana. The CDC has confirmed someone in Louisiana is now the first person in the United States with a severe case of the virus.

We are in a terrible situation and going into a worse situation,” said Angela Rasmussen, a virologist at the University of Saskatchewan in Canada.

In a case first reported in Louisiana, a patient has now developed the first known case of bird flu so severe as to require hospitalization.

California’s battle with bird flu has been intensified as two new confirmed cases have been found in Stanislaus and Los Angeles counties. The rate at which the flu lathers has led California Governor Gavin Newsom to declare a state of emergency on December 18.

Highly contagious H5N1 avian influenza, or “bird flu,” has been found in a Mississippi chicken flock. It’s the first major case of bird flu in Mississippi since 2023.