Paenibacillus urinalis was first isolated from the urine of a woman in 2008, and was reported to be a contaminant. Here, we report 5 cases of P. urinalis isolated over 5 months at a tertiary hospital. Using an API kit, 4 cases were classified as Cellulomonas species. Owing to the low reliability of API kit results and Gram stain results indicating gram variable bacilli for few specimens, MALDI-TOF MS and 16S rRNA gene sequencing were performed for identification. The last case showed Gram variable bacilli, and therefore, based on previous experience, 16S rRNA gene base sequence analysis was carried out without an additional API kit. All isolated strains were confirmed to be P. urinalis, and were judged to be contaminants. As for Gram variable bacteria, the use of current biochemical identification systems may lead to misidentification as other bacteria, which may cause unnecessary or improper use of antibiotics. Moreover, whereas most of the Paenibacillus species are reported to be contaminants, some of them are being reported as sources of infection. Therefore, more accurate identification will be necessary in the future. Accordingly, it is expected that accurate identification of this genus will help clinical physicians make decisions regarding appropriate treatment and use of antibiotics.
Anti-Bacterial Agents ; Bacteria ; Base Sequence ; Cellulomonas ; Female ; Genes, rRNA ; Humans ; Paenibacillus* ; Tertiary Care Centers

Arcanobacterium haemolyticum is a catalase-negative, aerobic gram-positive rod. It causes pharyngitis, skin and soft tissue infection, osteomyelitis, endocarditis, meningitis, pneumonia, and septicemia. We experienced a case of A. haemolyticum bacteremia and osteomyelitis in a diabetic patient. The organism was misidentified as Cellulomonas species by automated system but correctly identified as A. haemolyticum by 16s rRNA sequencing.
Arcanobacterium ; Bacteremia ; Cellulomonas ; Endocarditis ; Humans ; Meningitis ; Osteomyelitis ; Pharyngitis ; Pneumonia ; RNA ; Sepsis ; Sequence Analysis ; Skin ; Soft Tissue Infections