Abstract: Objective: Spontaneous bacterial peritonitis (SBP) is a frequent and severe entity in patients with cirrhosis or ascites due to other causes. However, Listeria monocytogenes is a microorganism that has been scarcely identified as a causative agent of SBP. Methods: In this study, a descriptive analysis of cases of L. monocytogenes SBP was carried out in our center for 26 years (1992-2017). Results: A total of eight patients were diagnosed, with an average age of 58 years, with no differences in sex distribution and all of them were community acquired cases. Half of the patients had underlying liver disease, two of them active malignancies; one was undergoing continuous ambulatory peritoneal dialysis and the last one with hypertensive heart disease. Six (75%) of the patients received a third-generation cephalosporin as empirical treatment. The clinical course was favorable after receiving directed antibiotic treatment in five (62.5%) of the patients. However, three of them, under the age of 59, died. Serotyping of L. monocytogenes isolates revealed that half of them were serovar 4, two 1 / 2a and the remaining one 1 / 2c. All strains were susceptible to ampicillin, meropenem, erythromycin and cotrimoxazole. Conclusions: We conclude by emphasizing the importance of taking this etiology into account in patients with underlying liver disease and with clinical or laboratory data suggesting SBP, mainly due to the need for specific antibiotic treatment different from conventionally empirically used.

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