(D) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$. When these pathogens enter the body through contaminated food and water,they pass t

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(D) Typhoid fever is caused by the bacterium $Salmonella$ $typhi$. When these pathogens enter the body through contaminated food and water,they pass through the digestive tract. They reach the small intestine first,where they penetrate the intestinal wall and migrate to other organs through the blood.