 There is one strain , E.coli # <unk> : H7 , that produces the Shiga toxin ( classified as a bioterrorism agent ) . This toxin causes premature destruction of the red blood cells , which then clog the body 's filtering system , the kidneys , causing hemolytic @-@ uremic syndrome ( HUS ) . This in turn causes strokes due to small clots of blood which lodge in capillaries in the brain . This causes the body parts controlled by this region of the brain not to work properly . In addition , this strain causes the buildup of fluid ( since the kidneys do not work ) , leading to edema around the lungs and legs and arms . This increase in fluid buildup especially around the lungs impedes the functioning of the heart , causing an increase in blood pressure . 
