Bird flu, or avian influenza, primarily affects birds but there have been cases reported in humans as well. Unfortunately, a patient recently died from severe avian influenza A (H5N1), marking the first fatality from bird flu in the United States.

Bird flu has been making the rounds in the United States over the last year and appears to be resurging again. Here’s what you need to know.

The first human death caused by H5N1 in the U.S. was reported in Louisiana on Jan. 6. Here's what to know about bird flu.