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 is a life-threatening infectious disease of the digestive tract caused by the bacterium Salmonella typhi. The disease lasts several weeks and convalescence takes some time.The incubation period is 10 to 20 days, depending on how large a dose of bacteria has been taken up.yphoid Fever. Typhoid fever is an infectious life-threatening disease of the digestive tract, and is still common where sanitation standards are low. Better prevention can reduce spreading of the disease, but new antibiotics and vaccines are needed.