FIG 4.

Growth of V. cholerae in adult calf serum is enhanced in the presence of 0.1 mM epinephrine or norepinephrine. Cells were grown aerobically in serum-SAPI (ACS) for 85 h at 37°C. The OD₆₀₀ was measured every hour for the first 54 h. Control without addition, black; 0.26 mM FeSO₄, green; 0.1 mM norepinephrine, blue; 0.1 mM epinephrine, red. Experiments were performed in triplicate, and outliers were omitted. Averages and standard errors were calculated from two experiments.