Priestia flexa[1] (Bacillus flexus before 2020) is an aerobic, Gram-variable, rod-shaped, endospore-forming, oxidase-positive bacterium.

The endospores are ellipsoidal, located in central/paracentral, unswollen sporangia.

In laboratory conditions, it produces opaque, creamish, raised-margin colonies at 30 ± 2°C when incubated for 24–72 hrs.

on tryptic soy agar.

This bacterial species may be isolated from feces (poultry) and soil.