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Table 2 LD50 of wild-type and mutant strains

From: Iron-regulated gene ireA in avian pathogenic Escherichia coli participates in adhesion and stress-resistance

Challenge dose (CFU/ml) Duck mortality
DE205B DE205BΔireA DE205BCΔireA
108 7/7 7/7 7/7
107 7/7 7/7 7/7
106 6/7 6/7 6/7
105 3/7 2/7 1/7
LD50 1.74 × 105 2.45 × 105 3.16 × 105