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Survival curves for rabbits injected with Stx1 or Stx2 intravenously. Two groups of rabbits were injected intravenously with 1.9 LD50 (39 ng/kg) of Stx1 or with 2.8 LD50 (2,500 ng/kg) of Stx2. The survival of the rabbits injected with Stx1 was significantly shorter than that of rabbits that received Stx2 (P = 0.023 by log rank test). The mean survival with Stx1 and Stx2 was 2.4 and 7.0 days, respectively.
