(B) Typhoid fever is caused by the bacterium $Salmonella \text{ } typhi$. This pathogen is transmitted through the fecal-oral route. Houseflies $(Musc

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(B) Typhoid fever is caused by the bacterium $Salmonella \text{ } typhi$. This pathogen is transmitted through the fecal-oral route. Houseflies $(Musca \text{ } domestica)$ act as mechanical vectors. They sit on contaminated feces and then transfer the pathogens to food, milk, or water, which, when consumed by humans, leads to infection.