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Comparison of the abilities of S. enteritidis isolates to invade and replicate in HeLa cells. Bars represent the ratio of intracellular bacteria to the input bacteria, calculated as (CFU of intracellular bacteria/CFU of input bacteria) × 100. Incubation was for 1 or 2 h as indicated. Values of over 100% indicate intracellular replication. Results from a single representative experiment performed in triplicate are presented. Error bars indicate standard deviations.
