The presence of different species of Bacillus is one contributing
factor in the reduction of the shelf-life of milk (Hanson et al., 2005)
because many of these species are psychrotolerant and find a good
level of nutrients in milk, which supports their growth even at low
temperature (Bartoszewicz et al., 2008;Walkling-Ribeiro,Rodríguez-
González, Jayaram, & Griffiths, 2011).