Pyogenic liver abscess caused by Fusobacterium animalis: the importance of updated laboratory databases for diagnosis

Fusobacterium animalis, recently reclassified from the Fusobacterium nucleatum complex, was identified as the cause of a pyogenic liver abscess in a 41-year-old man. Routine cultures were negative, but 16S rRNA sequencing detected the organism. This case highlights the importance of advanced diagnostics and clinical laboratories using databases with updated taxonomy.