Bird flu, also known as avian influenza or H5N1, has infected more than 130 million birds over the past two years as it threatened commercial bird operations and recently led to the first human death in the United States.

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.

After the United States recorded its first human death from bird flu, calls for the government to do more has intensified.