Abstract
Listeria monocytogenes continues to be one of the most important public health challenges for the meat sector. Many attempts have been made to establish the most efficient cleaning and disinfection protocols, but there is still the need for the sector to develop plans with different lines of action. In this regard, an interesting strategy could be based on the control of this type of foodborne pathogen through the resident microbiota naturally established on the surfaces. A potential inhibitor, Bacillus safensis, was found in a previous study that screened the interaction between the resident microbiota and L. monocytogenes in an Iberian pig processing plant. The aim of the present study was to evaluate the effect of preformed biofilms of Bacillus safensis on the adhesion and implantation of 22 strains of L. monocytogenes. Mature preformed B. safensis biofilms can inhibit adhesion and the biofilm formation of multiple L. monocytogenes strains, eliminating the pathogen by a currently unidentified mechanism. Due to the non-enterotoxigenic properties of B. safensis, its presence on certain meat industry surfaces should be favored and it could represent a new way to fight against the persistence of L. monocytogenes in accordance with other bacterial inhibitors and hygiene operations.
Highlights
Campylobacter spp. does not usually form its own biofilms and persists in food processing environments by invading biofilms formed by other bacteria [40]
This was consistent with our initial supposition, given that the microorganism was isolated from wild biofilms formed on Sensor Control Hygiene (SCH, Alinyma, Sant Cugat del Vallés, Spain) sensors located on different surfaces of the Iberian pig processing plant under study and was part of the dominant microbiota [14]
The preformed mature biofilms of B. safensis can inhibit the formation of biofilms of multiple strains of L. monocytogenes, destroying the pathogen by means of a currently unspecified mechanism
Summary
In 2017, a total of 2502 confirmed listeriosis cases were reported in the European Union/European Economic. Considering the data from previous years, the European Food Safety Authority (EFSA) and European Centre for Disease Prevention and Control (ECDC) has detected a constant increasing tendency of outbreaks since 2008 [4,5]. Listeriosis presents a high proportion of cases needing hospitalization in susceptible people [5]. Found in both food production and retail outlets, its ability to maintain itself in adverse environmental conditions makes it a very persistent pathogen that is greatly feared by the sector [1,2]
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