Abstract

The effects of multiple injections of bacterial endotoxin on blood coagulation in the toadfish, Opsanus tau, were studied. Preparations of endotoxin from Escherichia coli, Aeromonas hydrophila, or Vibrio harveyi (strain 392) were utilized. Three injections of endotoxin were administered at either 6 or 12 h intervals.Although there was a slight decrease in plasma fibrinogen concentration following the administration of endotoxin, levels did not significantly differ from normal controls. Endotoxins from E. coli and A. hydrophila initially shortened the prothrombin time (PT), but subsequently the PT returned to normal. In contrast, the partial thromboplastin time (PTT) was not shortened following the administration of bacterial endotoxin. There was no detectable effect on the plasma recalcification time. There were no significant differences between the red and white blood cell levels of control fish and fish that had received endotoxin. Endotoxins from A. hydrophila and V. harveyi reduced the survival of re...

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