In its announcement this week of the first human death from bird flu in the United States, health officials in Louisiana were quick to note that the patient was over age 65 and “reported to have underlying medical conditions.

The death of a Louisiana resident who was over the age of 65 signals that future H5N1 infections are not guaranteed to be mild, health experts say

The bird flu, also known as avian influenza and H5N1, was implicated in the first human death from the infectious disease on January 6. But still, no human-to-human transmission has been reported.