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The killing effect of MVs on B. stearothermophilus and A. thermoaerophilus strains is shown by comparing the number of CFU per ml over a 2-h treatment (open symbols). When compared with the same strains without MV treatment (solid symbols), it is apparent that MVs lyse and kill the bacteria. Strains E23 and 10155/C− do not have S-layers and were slightly more sensitive to the MVs than strains S65 and 10155/C+, which possess p4 S-layers.
