<i>Streptococcus equi</i> subsp. <i>zooepidemicus</i> Invades and Survives in Epithelial Cells.

Expressing the survival as CFU/ml instead of as percentages however reveals a highly significant difference between the strains in the actual number of surviving bacteria at 2, 9, and 21 h post-penicillin addition ( P < 0.0001), which again can be explained as a significant strain dependent difference in invasiveness (Figure 5 ).

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