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Francisella sp., a Close Relative of Francisella orientalis, Causing Septicemia with Cholestatic Hepatitis in a Patient with Anti-Interferon-γ (IFN-γ) Autoantibodies

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Francisella is an intracellular, fastidious, Gram-negative bacterium that is difficult to identify using routine microbiological methods in the laboratory. We studied the isolation of Francisella sp. (strain IDAMR664) from the… Click to show full abstract

Francisella is an intracellular, fastidious, Gram-negative bacterium that is difficult to identify using routine microbiological methods in the laboratory. We studied the isolation of Francisella sp. (strain IDAMR664) from the blood of a patient with anti-interferon-γ (IFN-γ) autoantibodies who presented with septicemia and cholestatic hepatitis. Analysis of the strain IDAMR664 genome sequence revealed the isolate was closely related to the strain GA01-2794 that had been isolated from a human in the USA. In addition, it was clustered with F. orientalis, a fish pathogen. The isolate contained several virulence factors and had Francisella pathogenicity island pattern no. 3.

Keywords: ifn autoantibodies; patient anti; francisella; septicemia cholestatic; interferon ifn; anti interferon

Journal Title: Tropical Medicine and Infectious Disease
Year Published: 2022

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