Abstract
Motivation: L. monocytogenes is known to persist in food processing environments, with some strains being routinely isolated (persistent), while others are only occasionally found (sporadic). This raises the question: Are persistent strains more resistant to stress conditions compared to sporadic strains from similar sources? Objective: To investigate the effect of food processing related stresses (pH=6 and 8% NaCl) on the behaviour of L. monocytogenes isolates from alheira sausage, compared to a set of reference conditions (37 °C, 0% NaCl, pH=7). Results: Compared to the reference conditions: High salinity conditions → significantly longer lag times and lower μmax for all isolates Low pH (pH = 6) reduced μmax but also shortened the lag phase for most isolates These sub-optimal conditions were insufficient to promote pathogen decay The persistent strains #2981 and #3048 do not exhibit a particular behavior nor appear to have increased resistance against the conditions tested This result is aligned with recent research. Conclusions: No significant differences were found between persistent and sporadic strains, suggesting that persistence events may not be explained by a better aptitude for growth. However, further research with a larger number of isolates is needed.
Original language | English |
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Number of pages | 1 |
Publication status | Published - Apr 2024 |
Event | 2024 IAFP European Symposium - Geneva, Switzerland Duration: 30 Apr 2024 → 2 May 2024 |
Conference
Conference | 2024 IAFP European Symposium |
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Country/Territory | Switzerland |
City | Geneva |
Period | 30/04/24 → 2/05/24 |