The death comes at a time when the H5N1 virus has recently undergone an unusual mutation that is causing concern to the World Health Organization.

The first patient hospitalized with avian influenza in the United States has died in Louisiana, the state's department of health announced Monday.

The first person to have a severe case of H5N1 bird flu in the United States has died, according to the Louisiana Department of Health.

A patient who was hospitalized with the first human case of pathogenic avian influenza, or H5N1, in Louisiana and the United States has died.

A patient in Louisiana who contracted a severe case of the bird flu virus H5N1 has died from the infection. This makes them the first known bird flu death

The first human patient in the United States with a confirmed case of avian influenza has died, according to a press release from the Louisiana Department of Health. The individual was older than 65 years and had underlying medical conditions and remains the only known human case in the state.

The patient, who was older than 65 and had underlying medical conditions, was hospitalized weeks ago in critical condition with severe respiratory illness.

The LDH revealed that the patient was over age 65, had underlying medical conditions and contracted bird flu after exposure to both wild birds and a non-commercial backyard flock.

More should be done to control the spread of bird flu among animals to avoid more cases in humans, the World Organisation for Animal Health (WOAH) said on Wednesday, following the first death of a patient from the virus in the United States.