Abstract
Tissierella praeacuta is a gram negative anaerobe with few documented cases of human infections. This case illustrates a patient who was admitted for infected chronic sacral and ischial decubitus wounds. BACT/ALERT blood culture system using Matrix Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) (Bruker Daltonics, Billerica, USA) was employed ultimately identifying Tissierella praeacuta as the causative organism. The suspected source of the pathogen was presumed to be from his infected decubitus wounds.