Polymicrobial Infections in Liver Abscesses of Cattle: New Insights from Kansas State University Researchers

Strategic Insights -

Life Sciences researchers at Kansas State University have made significant findings on the etiology of liver abscesses (LAs) in cattle. The study, which involved the analysis of culture-based prevalence of pathogens and quantitative PCR-based prevalence and concentrations of bacterial species in liver abscesses and matched ruminal and colonic epithelial tissues, revealed that liver abscesses are polymicrobial infections initiated primarily by the translocation of two subspecies of and secondarily by from the rumen into the liver via portal blood. The research suggests that the hindgut is a potential source of pathogens that cause LAs, in addition to the rumen.

Key Takeaways:

  • Polymicrobial infections, initiated primarily by two subspecies of and secondarily by from the rumen, are responsible for liver abscesses in cattle.
  • The study analyzed liver abscesses and matched ruminal and colonic epithelial tissues to determine culture-based prevalence of pathogens, including and , which have not been targeted before.
  • was the most dominant species in liver abscesses detected by both culture and PCR methods, with concentrations ranging from 7.0 to 7.5 log colony forming units (CFU).
  • Colonic epithelial tissues yielded more isolates than ruminal epithelial tissues, suggesting the hindgut as a potential source of pathogens causing LAs.
  • A majority of isolates were obtained after enrichment, indicating low concentrations and suggesting that may not be a significant contributor to LA development.
  • The study reaffirms that LAs are polymicrobial infections, with being the most dominant species prevalent.

Statistics:

  • 7.0 to 7.5 log CFU: concentrations of in liver abscesses.
  • 34/96 (35.2%): proportion of isolates obtained after enrichment.
  • 173/96 (180.4%): proportion of isolates obtained in colonic epithelial tissues.

Sources:

  • NewsRx. Reports from Kansas State University Describe Recent Advances in Microbiology (Further delineation of the etiology of liver abscesses in cattle and indication of hindgut as a potential source of pathogens). Life Science Weekly. October 21, 2025; p 4603.
  • Microbiology Spectrum, 2025. Amer Soc Microbiology, 1752 N St NW, Washington, DC 20036-2904, USA.