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Actinomyces odontolyticus is a strictly anaerobic species, a member of the Actinomyces genus and of the commensal flora, especially oral flora, which can trigger severe infections through breaches in healthy tissue or necrotic tissue that are often hard to diagnose clinically and microbiologically. Most infections with this species are pulmonary or pleural, which might hint at a connection with poor dental hygiene, but other locations have been documented. We present a case of a tubo-ovarian abscess with a difficult identification of the etiological agent in a woman with multiple admissions, no significant comorbidities, and a longstanding use of an IUD (intrauterine device). To our knowledge, no previous case of tubo-ovarian abscess with an accurate A. odontolyticus microbiological species identification has been reported so far. This case also highlights the importance of considering an anaerobic species as an etiologic agent in an infectious process concerning a previously damaged tissue and the importance of appropriate harvesting and culturing in the accurate diagnosis of such species. [ABSTRACT FROM AUTHOR]