Elderly or chronically ill, bedridden patients are prone to
develop decubitus ulcer (also called as bed sore or pressure
sore); the most common site being near the anus or on
the lower extremities. Most frequent organisms infect the
decubitus ulcer are gastrointestinal flora (e.g. Bacteroides fragilis, or nosocomial pathogens (e.g. S. aureus and P.