1 Blood clots can also obstruct veins, causing pain. 2  Veins return blood from the legs to the heart. 3  There are two systems of veins in the leg: superficial and deep. 4  If a blood clot occurs in a deep vein (deep venous thrombosis), it causes a damming effect, and blood is trapped behind the blockage.
Typhoid fever, also known simply as typhoid, is a symptomatic bacterial infection due to Salmonella typhi. Symptoms may vary from mild to severe and usually begin six to thirty days after exposure.
Typhoid fever (also known as Enteric fever) is caused by a strain of Salmonella bacteria (Salmonellae typhi) when they are spread through the body by the white blood cells that attempted to destroy them.   Salmonella are ingested from contaminated food or water and enter the body through the intestinal tract.yphoid fever is caused by the bacteria salmonella typhi; it is a gram-negative, short bacillus (rod-shape), with peritrichous flagella (many projecting in all directions).