Fig. 9
Relationship of challenge dose of Staphylococcus aureus and Escherichia coli lysate with lung: heart weight ratios. The data show the ratio of lung and heart weights measured at the time of postmortem examination, 24 h after 4 calves were administered 108, 109, 1010 or 1011 CFU-equivalents of Staphylococcus aureus and Escherichia coli lysate by aerosol. The ratio of lung to heart weight was correlated with the dose of bacterial lysate (R2 = 0.96, P = 0.003)