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*Viral haemorrhagic fevers.
 
*Viral haemorrhagic fevers.
 
*Certain snake venoms.
 
*Certain snake venoms.
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''Pathophysiology'':
      
Once coagulation begins a positive feedback loop is set up whereby coagulation inhibitors are consumed, allowing more coagulation.  In this way coagulation continues and induces further coagulation.   
 
Once coagulation begins a positive feedback loop is set up whereby coagulation inhibitors are consumed, allowing more coagulation.  In this way coagulation continues and induces further coagulation.   
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