Özet:

Bacillus cereus is a motile and spore-forming Gram positive rod and is a microorganism species which causes infections such as food poisoning, endocarditis, bacteremia sepsis. In our case; 57 years old, acute myeloid leukemia diagnosed female patient who had bone narrow transplantation and getting chemotherapy was interned with prediagnosis of neutropenic fever and pneumonia in internal medicine clinics which she admitted with high fever. Since B.cereus growth in peripheral vein blood cultures, catheter blood cultures was performed simultaneously. B.cereus growth repeated in the cultures so catheter caused bacteremia was considered as the diagnosis and antibiotherapy was expanded. After treatment, no growth was observed except catheter blood cultures, the general condition of the patient improved and every fever disappeared. Pulsed-field gel electrophoresis was performed in order to investigate the clonal relatedness between B.cereus isolates which were grown in three cultures of separate times and isolates were observed as the same clone. Blood cultures yielded B.cereus are usually considered the possibility of contamination so some clinical laboratories do not perform identification at species level. But the species that is isolated may be the cause of infection, so this approach may be time-consuming for the patient and cause a delay in necessary treatment. In such cases; repeat blood culture should be requested and a decision should be made whether to perform species identification according to the patient's immune system condition and clinical presentation.

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