Translocation of Mycobacterium tuberculosis after experimental ingestion

PLoS One. 2019 Dec 30;14(12):e0227005. doi: 10.1371/journal.pone.0227005. eCollection 2019.

Abstract

Human tuberculosis is a life-threatening infection following the inhalation of Mycobacterium tuberculosis, while the closely related bacteria Mycobacterium bovis and Mycobacterium canettii are thought to be transmitted by ingestion. To explore whether M. tuberculosis could also infect individuals by ingestion, male BALBc mice were fed 2 x 106 CFUs of M. tuberculosis Beijing or phosphate-buffered saline as a negative control, over a 28-day experiment. While eight negative control mice remained disease-free, M. tuberculosis was identified in the lymph nodes and lungs of 8/14 mice and in the spleens of 4/14 mice by microscopy, PCR-based detection and culture. Whole-genome sequencing confirmed the identity of the inoculum and the tissue isolates. In these genetically identical mice, the dissemination of M. tuberculosis correlated with the results of the culture detection of four intestinal bacteria. These observations indicate that ingested M. tuberculosis mycobacteria can translocate, notably provoking lymphatic tuberculosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Bacterial Translocation*
  • Eating*
  • Lung / microbiology
  • Lymph Nodes / microbiology
  • Male
  • Mice
  • Mice, Inbred BALB C
  • Mycobacterium tuberculosis / isolation & purification*
  • Mycobacterium tuberculosis / physiology
  • Spleen / microbiology
  • Tuberculosis / transmission*
  • Tuberculosis / virology

Grants and funding

This work was supported by the French Government under the Investissements d’avenir (Investments for the Future) program managed by the Agence Nationale de la Recherche (ANR, fr: National Agency for Research), (reference: Méditerranée Infection 10-IAHU-03). This work was supported by Région Le Sud (Provence Alpes Côte d’Azur) and European funding FEDER PA 0000320 PRIMI. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.