Abstract
BACKGROUND: Ottowia massiliensis sp.nov. is a slow-growing and Gram-stain-negative bacillus, first isolated from the stool sample of a healthy volunteer. Due to its slow growth and challenging cultivation, it is easily overlooked in clinical microbiology laboratories. This case report is the first case of its pathogenicity. CASE PRESENTATION: This case report describes a case of canaliculitis caused by Ottowia massiliensis sp.nov. The patient, an 80-year-old woman, presented with bilateral epiphora and discharge lasting for 4 years, which worsened with redness and swelling over the past week. Microbial culture of the lacrimal duct secretion after 72 h on Columbia blood agar showed small colonies. MALDI-TOF MS did not yield accurate results, but 16 S rDNA sequencing identified the bacterium as Ottowia massiliensis sp.nov. (LT960589.1). Antimicrobial sensitivity tests showed high activity against most ophthalmic drugs. CONCLUSIONS: In the case described here, we discuss the diagnosis and treatment strategies for eye infections caused by Ottowia massiliensis sp.nov., laying the foundation for improving clinical and laboratory awareness of this bacterium.