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 caused by the bacteria salmonella typhi; it is a gram-negative, short bacillus (rod-shape), with peritrichous flagella (many projecting in all directions).I â¦ t is a type of salmonella bacteria. Typhoid belongs to the family Enterobacteriaceae, the same as E. coli.yphoid fever-also known simply as typhoid-is  a common worldwide bacterial disease transmitted by the ingestion  of food or water contaminated with the feces  of an in â¦ fected person, which contain the bacterium Salmonella enterica  subsp. enterica, serovar Typhi.