Which organism is most commonly associated with spondylodiscitis?

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Staphylococcus aureus is the organism most commonly associated with spondylodiscitis because spine infections usually originate from bacteria traveling in the bloodstream, and S. aureus is the most frequent cause of hematogenous (blood-borne) infections including osteomyelitis. Its virulence factors help it adhere to bone and invade the vertebral endplates and adjacent disc, and it readily seeds the spine when present in the circulation. The vertebral endplates and the disc space are particularly susceptible to seeding, so infection often begins there and can progress with rapid inflammation. Because of its prominence, initial treatment for suspected spondylodiscitis typically targets Staphylococcus aureus (including MRSA in many settings). Other organisms like Pseudomonas, E. coli, or Streptococcus pneumoniae can cause spine infections but are much less common in comparison.