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Serum assays (80% serum) of GR-12 and O75−, K5−, and O75− K5− mutants at an inoculum of 3 × 107 CFU/ml. The assays were performed for 3 h. Samples were taken in duplicate at the start and at each hour. The graph is a result of at least two different assays for each strain. Results are shown as percent viability. Error bars indicate standard deviations.
