Potential enterotoxicity of phylogenetically various Bacillus cereus sensu lato soil isolates from different geographical locations.

Potential enterotoxicity of phylogenetically various Bacillus cereus sensu lato soil isolates from different geographical locations. Appl Environ Microbiol. 2020 Mar 27;: Authors: Drewnowska JM, Stefanska N, Czerniecka M, Zambrowski G, Swiecicka I Abstract Bacillus cereus sensu lato (B. cereus s.l.) comprises gram-positive spore-forming bacteria producing toxins associated with foodborne diseases. Three pore-forming enterotoxins, non-haemolytic enterotoxin (Nhe), haemolysin BL (Hbl), and cytotoxin K (CytK), are considered as the primary factors in B. cereus s.l. diarrhoea. The aim of this study was to determine the potential risk of enterotoxicity among soil B. cereus s.l. isolates representing various phylogroups and originated from different geographic locations varying in climate (Burkina Faso, Kenya, Argentina, Kazakhstan, and Poland). While, the nheA- and hblA-positive isolates are present among all B. cereus s.l. populations and distributed across all phylogenetic groups, the cytK-2-positive strains predominate in geographic regions with arid hot climate (Africa) and clustered together on a phylogenetic tree mainly within mesophilic groups III and IV. The highest in vitro cytotoxicity to Caco-2 and HeLa cells was demonstrated by the strains clustered within phylogroups II and IV. Overall, our results suggest that B. cereus s.l. pathogenicity is a comprehensive process conditioned by many intracellular factors and diverse environmental conditions.IM...
Source: Applied and Environmental Microbiology - Category: Microbiology Authors: Tags: Appl Environ Microbiol Source Type: research

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