Discitis, vertebral osteomyelitis, epidural abscesses pathomechanism:

Hematogenous, direct spread(psoas, bowel, aorta,..), direct inoculation S. aureus(MOST), Gram-negative enteric bacteria, Pseudomonas, Candida, Strepto, tbc Brucella, Burkholderia, Salmonella, Entamoeba stb.(rare)