A Rare Agent in Blood: Rothia kristinae.

Rothia kristinae, a Gram-positive coccus often regarded as a harmless commensal, is emerging as a potential pathogen, especially in immunocompromised patients. We hereby present a case involving R. kristinae bacteremia in a 66-year-old female patient with a history of multiple myeloma and end-stage renal disease following a hematopoietic stem cell transplant. Despite initial doubts about its clinical significance, repeated isolation from blood cultures prompted consideration of infection rather than colonization. This case highlights the importance of considering rare pathogens in immunocompromised hosts. Additional investigation is essential to gain a more comprehensive understanding of the clinical features and management of infections caused by R. kristinae.