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Strain-specific interactions between Listeria monocytogenes and Salmonella typhimurium in co-culture conditions
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Introduction & Aim: Listeria monocytogenes is a foodborne pathogen associated with listeriosis, a severe infection with high mortality rates, especially among high-risk groups including the elderly, pregnant women, neonates, and immunocompromised individuals[1]. Within the human gastrointestinal tract, colonization by L. monocytogenes is challenged by several defense mechanisms, among which the gut microbiota plays a pivotal role in suppressing pathogen overgrowth and invasion[2]. This study aimed to assess the interactions between L. monocytogenes and Salmonella enterica serovar Typhimurium, a facultative pathogen that can transiently inhabit the human gut, to better understand how microbial competition may influence Listeria survival and behavior. Conclusion and Relevance: The results indicate that interactions between L. monocytogenes and S. Typhimurium are strain-dependent, with strain 2606 being more adversely affected by co-culture. These findings underscore the importance of microbial competition in shaping pathogen behavior in the gut environment. Future research will broaden this investigation by including a larger set of L. monocytogenes strains and co-culturing them with additional gut-associated bacteria to gain deeper insights into ecological interactions influencing pathogenicity and survival.
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Oliveira, M., Barbosa, J., & Teixeira, P. (2025). Strain-specific interactions between listeria monocytogenes and salmonella typhimurium in co-culture conditions. 1-1. Poster session presented at 39th EFFoST International Conference 2025, Porto, Portugal.
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