1887

Abstract

serovar Typhi primarily persists in chronic carriers by forming biofilms on gallstones in the gallbladder. We have developed a gallstone mouse model to study chronic carriage. To better understand the infection timeline and differentiate between mice that have maintained long-term gallbladder carriage from those that have cleared infection, we utilized bioluminescent . Typhimurium and imaging to detect and track the organ-specific presence of bacteria in living mice. The mice infected with our bioluminescent . Typhimurium showed luminescence in the abdomen as early as 3 days in comparison to the mice infected with non-luminescent WT . Typhimurium. With our methods, we achieve image resolution such that we can confidently identify the presence of . Typhimurium in the gallbladder at >60 days post-infection. Using these methods, we have determined that the minimum number of bacteria necessary to detect luminescence in the mice is 10 c.f.u. and that one out of six initially infected mice will remain persistently infected for greater than 60 days, with gallbladder bacterial loads reaching upwards of 10 per milligram of tissue. Given that our limit of detection of luminescence is 10 c.f.u., our sensitivity is robust enough to identify the bacterial loads present in the average chronically infected mouse. The quantification of individual organs’ bacterial c.f.u. and comparison of luminescence between WT and luminescent . Typhimurium validate that our technique is specific and sensitive enough to detect organ-specific infection in our model of typhoidal chronic carriage.

Funding
This study was supported by the:
  • College of Medicine Office of Research, Ohio State University (Award Infectious Diseases Institute Transformative Trainee award)
    • Principle Award Recipient: AliyahNicole Bennett
  • National Institute of Allergy and Infectious Diseases (Award R01AI116917-07A1S1)
    • Principle Award Recipient: JohnSpencer Gunn
  • National Institute of Allergy and Infectious Diseases (Award R01AI116917)
    • Principle Award Recipient: JohnSpencer Gunn
  • This is an open-access article distributed under the terms of the Creative Commons Attribution License. This article was made open access via a Publish and Read agreement between the Microbiology Society and the corresponding author’s institution.
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2024-12-05
2024-12-08
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