Purpura
![[[Petechiae]] and purpura on the lower limb due to infection-associated [[vasculitis]]](https://upload.wikimedia.org/wikipedia/commons/0/0e/HSP_Vasculitis.jpg)
Purpura is common with typhus and can be present with meningitis caused by meningococci or septicaemia. In particular, meningococcus (''Neisseria meningitidis''), a Gram-negative diplococcus organism, releases endotoxin when it lyses. Endotoxin activates the Hageman factor (clotting factor XII), which causes disseminated intravascular coagulation (DIC). The DIC is what appears as a rash on the affected individual. Provided by Wikipedia
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