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As platelets are used up in the thrombi a thrombocytopaenia occurs, leading to a paradoxical haemorrhage and the patient starts to bleed.  This is the mechanism by which most viral haemorrahgic diseases cause their clinical signs.
 
As platelets are used up in the thrombi a thrombocytopaenia occurs, leading to a paradoxical haemorrhage and the patient starts to bleed.  This is the mechanism by which most viral haemorrahgic diseases cause their clinical signs.
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==Dignosis==
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==Diagnosis==
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==Clinical Signs==
 
==Clinical Signs==
 
==Laboratory Tests==
 
==Laboratory Tests==
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