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Misidentification of Brevibacterium casei as Propionibacterium acnes Isolated from the Blood of a Patient with Malignant Lymphoma

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Abstract

Brevibacterium ±ÕÁ¾Àº V ¸ð¾ç ȤÀº ºÒ±ÔÄ¢ÇÑ ¸ð¾çÀ» º¸ÀÌ´Â ±×¶÷ ¾ç¼º °£±ÕÀ¸·Î, corynebacteria¿Í ºñ½ÁÇÑ Æ¯Â¡À» °¡Áö´Â Àý´ë È£±â¼º ±ÕÁ¾ÀÌ´Ù. ´ë°³ »ç¶÷ÀÇ Á¡¸·À̳ª ÇǺο¡ »óÀç±ÕÀ¸·Î Á¸ÀçÇÏ¿© ºñº´¿ø¼ºÀ¸·Î ¿©°ÜÁ® ¿ÔÀ¸¸ç »ç¶÷¿¡¼­ÀÇ °¨¿°ÀÌ º¸°íµÈ ¿¹´Â ¸Å¿ì µå¹°´Ù. º» Áõ·Ê¿¡¼­´Â ¹Ì¸¸¼º ´ë¼¼Æ÷Çü B ¼¼Æ÷ ¸²ÇÁÁ¾À» Áø´Ü¹ÞÀº 46¼¼ ³²ÀÚȯÀÚ¿¡¼­ ¹ß¿­ Áõ»óÀÌ ÀÖ¾î ¸»ÃÊÇ÷¾×°ú Hickman Ä«Å×Å͸¦ ÅëÇØ Ç÷¾×¹è¾çÀ» ½Ç½ÃÇÑ °á°ú Çø±â¼º Ç÷¾× ¹è¾çº´¿¡¼­´Â ÀÚ¶óÁö ¾Ê°í È£±â¼º Ç÷¾× ¹è¾çº´¿¡¼­¸¸ ÀÚ¶ó´Â ±ÕÀÇ Áõ½ÄÀÌ È®ÀεǾú´Ù. ÀÌ´Â VITEK II ANC card¿¡¼­ Propionibacterium acnes·Î µ¿Á¤µÇ¾úÀ¸³ª16S rRNA À¯ÀüÀÚ ¿°±â¼­¿­ ºÐ¼®À» ÅëÇÏ¿© B. casei·Î È®ÀεǾú´Ù. º» Áõ·Ê´Â 16S rRNA À¯ÀüÀÚ ¿°±â¼­¿­ ºÐ¼®À» ÅëÇØ B. casei·Î ÀÎÇÑ Ä«Å×ÅÍ °ü·Ã Ç÷·ù°¨¿°À» Áø´ÜÇÑ Ã¹ º¸°íÀ̸ç, Áõ·Ê¿¡¼­¿Í °°ÀÌ ÀÚµ¿È­ Àåºñ¿¡¼­ º¸°íµÇ´Â ±ÕÀÌ ±âŸ ¹Ì»ý¹° °Ë»ç½ÇÀÇ °Ë»ç¼Ò°ß ¹× »ýÈ­ÇÐÀû ¼º»ó°ú ºÒÀÏÄ¡ ¼Ò°ßÀ» º¸ÀÌ´Â °æ¿ì 16S rRNA À¯ÀüÀÚ ¿°±â¼­¿­ ºÐ¼®ÀÌ ¸Å¿ì À¯¿ëÇÔÀ» ¾Ë ¼ö ÀÖ´Ù.
Brevibacterium spp. are Gram-positive, irregularly rod-shaped, strictly aerobic bacteria that resemble corynebacteria. Since they are a part of normal skin flora, they have been regarded as apathogenic, and human infections related to them are very rare. A 46-year-old man previously diagnosed with diffuse large B-cell lymphoma presented with fever without a definitive infectious source. Blood cultures from both peripheral blood and a central venous catheter showed that only aerobic bottles grew contaminants, while anaerobic bottles did not. Although the automated microbial identification system indicated Propionibacterium acnes, the isolated species was identified as B. casei by 16S rRNA sequence analysis. Our case emphasizes the utilization of 16S rRNA sequence analysis when the result from an automated system does not correspond with other laboratory findings. This is the first case of catheter-related blood stream infection due to B. casei identified by 16S rRNA sequence analysis.

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Brevibacterium casei bacteremia, 16S rRNA sequence analysis
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