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Invasion frequency of Y. pestis strains cocultured with A. castellanii ATCC 30010. White bars indicate an MOI of 1 and gray bars an MOI of 100. Error bars represent mean ± standard deviation (SD) of the results from 3 to 6 independent experiments. Statistically significant differences are indicated by ** for P < 0.01 and by *** for P < 0.001, and ns means not statistically significant.
