Adaptation of Bacillus species to dairy associated environment facilitates their biofilm forming ability

Ievgeniia Ostrov, Noa Sela, Eduard Belausov, Doron Steinberg, Moshe Shemesh*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations


Biofilm-forming Bacillus species are often involved in contamination of dairy products and therefore present a major microbiological challenge in the field of food quality and safety. In this study, we sequenced and analyzed the genomes of milk- and non-milk-derived Bacillus strains, and evaluated their biofilm-formation potential in milk. Unlike non-dairy Bacillus isolates, the dairy-associated Bacillus strains were characterized by formation of robust submerged and air–liquid interface biofilm (pellicle) during growth in milk. Moreover, genome comparison analysis revealed notable differences in putative biofilm-associated determinants between the dairy and non-dairy Bacillus isolates, which correlated with biofilm phenotype. These results suggest that biofilm formation by Bacillus species might represent a presumable adaptation strategy to the dairy environment.

Original languageAmerican English
Pages (from-to)316-324
Number of pages9
JournalFood Microbiology
StatePublished - Sep 2019

Bibliographical note

Funding Information:
This work was partially supported by the Israel Dairy Board [grant number 4210343 ] grant. IO is recipient of PhD scholarship from the Ministry of Absorption and Integration of Israel as well as excellence in research scholarship from Israel Dairy Board Fund.

Publisher Copyright:
© 2019 The Authors


  • Bacillus species
  • Dairy biofilm
  • Genome comparison analysis
  • Milk quality
  • Pellicle formation


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