FIG. 5.

Serum assays of wild-type strain GR-12 and mutants in 80% serum (A) or 80% heat-inactivated serum (B) with an inoculum of 3 × 10⁵ CFU/ml. The assays were performed for 3 h; samples were taken in duplicate at the start and at each hour. The graphs are a result of at least two different assays for each strain. Results are shown as percent viability. Error bars indicate standard deviations.