Enteric fever, also known as typhoid fever, is an acute disease related to fever caused by a bacteria called Salmonella enterica serotype Typhi. It could also be due to Salmonella paratyphi, an associated bacterium that generally causes less serious disease.
In addition, enteric fever can be acquired by eating or drinking contaminated drinks or foods that have bacteria on them. Individuals with an acute disease can infect the nearby water supply via feces, which has a greater concentration of bacteria.
The contamination in the water source could, in turn, contaminate the food source. Moreover, the bacteria can persist or survive for more weeks in dried sewage and water.