Spores of C. botulinum Beluga WT and Beluga Ei were used to inoculate CMM-TPGY in three biological replicates. Culture OD600 was measured at a wavelength of 600 nm using a Thermo Spectronic Genesys 10 UV/Vis Spectrophotometer. Heat-resistant spore and viable cell concentrations were determined as described42 (link) applying the most probable number technique57 (link). One-way ANOVA was used to compare the total viable cell and spore counts.
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