Keywords: Pseudomonas; acute hematogenous periprosthetic joint infection (PJI); chronic periprosthetic joint infection (PJI); culture negative; enterococcal; geographic variance in organism profile; hip and knee organism profile; methicillin-resistant Staphylococcus aureus (MRSA); monomicrobial periprosthetic joint infection (PJI); periprosthetic joint infection (PJI); polymicrobial periprosthetic joint infection (PJI); staphylococcal; streptococcal periprosthetic joint infection (PJI); surgical site infection (SSI); virulence.