Finafloxacin, a Novel Fluoroquinolone, Reduces the Clinical Signs of Infection and Pathology in a Mouse Model of Q Fever

M. Gill Hartley*, Isobel H. Norville, Mark I. Richards, Kay B. Barnes, Kevin R. Bewley, Julia Vipond, Emma Rayner, Andreas Vente, Stuart J. Armstrong, Sarah V. Harding

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Finafloxacin is a novel fluoroquinolone with optimal antibacterial activity in low pH environments, therefore offering a therapeutic advantage over some traditional antibiotics, in treating bacterial infections associated with acidic foci. Coxiella burnetii, the causative agent of Q fever, is a bacterium which resides and replicates in acidic intracellular parasitic vacuoles. The efficacy of finafloxacin was evaluated in vivo using the A/J mouse model of inhalational Q fever and was compared to doxycycline, the standard treatment for this infection and ciprofloxacin, a comparator fluoroquinolone. Finafloxacin reduced the severity of the clinical signs of infection and weight loss associated with Q fever, but did not reduce the level of bacterial colonization in tissues compared to doxycycline or ciprofloxacin. However, histopathological analysis suggested that treatment with finafloxacin reduced tissue damage associated with C. burnetii infection. In addition, we report for the first time, the use of viable counts on axenic media to evaluate antibiotic efficacy in vivo.

Original languageEnglish
Article number760698
JournalFrontiers in Microbiology
Publication statusPublished - 30 Nov 2021

Bibliographical note

Publisher Copyright:
Crown copyright © 2021 Dstl. Authors: Gill, Norville, Richards, Barnes, Bewley, Vipond, Rayner, Vente, Armstrong and Harding.


  • antibiotics
  • bacterial counts
  • Coxiella
  • PCR
  • splenomegaly


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