A Louisiana patient who had been hospitalized with severe bird flu has died, the first such fatality in the United States, state health officials reported on Monday.

The patient was older than 65 and had underlying medical conditions, the officials said. The individual became infected with the bird flu virus, H5N1, after exposure to a backyard flock and wild birds.

There is no sign that the virus is spreading from person to person anywhere in the country, and Louisiana officials have not identified any other cases in the state. Pasteurized dairy products remain safe to consume.