Diagnostic challenge of gastrointestinal infection due to lactose-fermenting Salmonella enterica subsp. enterica serovar 4,5:I:-

Mathilde Payen (1) , Maria Pardos (2) , Aurélie Cointe (1, 3) , Alix Massiot (1) , Philippe Bidet (1, 3) , François-Xavier Weill (2) , Stéphane Bonacorsi (1, 3)

1 AP-HP Hôpital universitaire Robert-Debré [Paris]
2 CNR-ESS - Centre National de Référence - National Reference Center Escherichia coli, Shigella et Salmonella
3 IAME (UMR_S_1137 / U1137) - Infection, Anti-microbiens, Modélisation, Evolution

Here, we describe a case of a nontyphoidal Salmonella disease caused by a Salmonella enterica serovar 4,5:i:- (monophasic Salmonella typhimurium) which acquired a Lac operon. This lactose-fermenting bacterium presents a major challenge for phenotypical detection of Salmonella. Only specific agar plates or molecular techniques allow reliable detection.

Keywords: C8-esterase; Lac operon; Lactose-fermenting Salmonella; Monophasic Salmonella; Salmonella typhimurium

Domains: Bacteriology

Mathilde Payen, Maria Pardos, Aurélie Cointe, Alix Massiot, Philippe Bidet, et al.. Diagnostic challenge of gastrointestinal infection due to lactose-fermenting Salmonella enterica subsp. enterica serovar 4,5:I:-. Diagnostic Microbiology and Infectious Disease, 2020, 98 (2), pp.115105. ⟨10.1016/j.diagmicrobio.2020.115105⟩. ⟨pasteur-02944029⟩