Findaureus: An open-source application for locating Staphylococcus aureus in fluorescence-labelled infected bone tissue slices

PLoS One. 2024 Jan 31;19(1):e0296854. doi: 10.1371/journal.pone.0296854. eCollection 2024.

Abstract

Staphylococcus aureus (S. aureus) is a facultative pathogenic bacterium that can cause infections in various tissue types in humans. Fluorescence imaging techniques have been employed to visualize the bacteria in ex-vivo samples mostly in research, aiding in the understanding of the etiology of the pathogen. However, the multispectral images generated from fluorescence microscopes are complex, making it difficult to locate bacteria across image files, especially in consecutive planes with different imaging depths. To address this issue, we present Findaureus, an open-source application specifically designed to locate and extract critical information about bacteria, especially S. aureus. Due to the limited availability of datasets, we tested the application on a dataset comprising fluorescence-labelled infected mouse bone tissue images, achieving an accuracy of 95%. We compared Findaureus with other state-of-the-art image analysis tools and found that it performed better, given its specificity toward bacteria localization. The proposed approach has the potential to aid in medical research of bone infections and can be extended to other tissue and bacteria types in the future.

MeSH terms

  • Animals
  • Bacteria
  • Bone and Bones / diagnostic imaging
  • Humans
  • Mice
  • Microscopy, Fluorescence
  • Staphylococcal Infections* / diagnostic imaging
  • Staphylococcal Infections* / microbiology
  • Staphylococcus aureus*

Grants and funding

This work was supported by the Marie Sklodowska Curie ITN-EID, Horizon 2020 project IMAGE-IN (grant agreement No 861122). We acknowledge support from the Jena Biophotonics and Imaging Laboratory (JBIL), from the European Union via EFRE funds within the Thüringer Innovationszentrum für Medizintechnik-Lösungen (ThIMEDOP, FKZ IZN 2018 0002), the BMBF via the funding program Photonics Research Germany (LPI, FKZ: 13N15713) and via the CSCC (FKZ 01EO1502). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. There was no additional external funding received during the study.