MRCP UK EXAMINATIONS

A histological research of an autopsy material revealed in a brain tissue a wide zone of proliferating microglia cells round small vessels. In addition, the marked proliferation of an endothelium, an adventitia and pericytes were determined in the skin vessels. Perivascular moderate lymphocytes infiltration with single neutrophiles added was also found. The vessels walls underwent various signs of destruction. Name the causative organism of described infection disease?