With reports of the first human death from bird flu in the US, some Americans are feeling an uncomfortable flashback to the early days of Covid-19, when infectious disease experts were talking about a new virus that was sending people to the hospital with respiratory infections.

On Monday, Louisiana health officials announced that a person hospitalized last month with a severe case of avian influenza — also known as H5N1 bird flu — died. This is the first human death from bird flu in the U.S.

How deadly is the bird flu? The US has reported its first death from avian influenza, H5N1. Here's what to know about bird flu mortality rate and who is at risk.