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Confocal laser scanning microscopy comparison of melamine surfaces inoculated with Staphylococcus aureus with no pretreatment (a) and inoculated following treatment with the Bacillus sp. blend (b), and nonpretreated surfaces challenged with Escherichia coli (c) and following treatment with the Bacillus sp. blend (d). S. aureus and E. coli are stained blue, with the Bacillus stained yellow.
