Summary
By means of a new model, the fowl plague of chickens, further evidence is given that
viruses may trigger blood coagulation. Macroscopically, hemorrhages were observed,
whereas microscopic studies revealed platelet and fibrin thrombi in the small vessels
of various organs. Hematologic studies demonstrated an increase in the clotting time
and a decrease in the activities of clotting factors I, II, VIII and X, and drop in
platelet counts. Heparin could diminish the hemorrhages but did not influence the
survival time of the animals.