Final answer:
Intestinal infection with Salmonella typhi can lead to extra-intestinal disease, such as the production of a serious fever. Other options listed in the question can cause intestinal infection and associated symptoms, but they are not specifically known for producing a serious fever as a result of the infection.
Step-by-step explanation:
The correct answer is B. Salmonella typhi.
Intestinal infection with Salmonella typhi can lead to extra-intestinal disease, such as the production of a serious fever. This is because S. typhi causes a more severe form of salmonellosis called typhoid fever, which is characterized by high fever, body aches, headache, nausea, lethargy, and a possible rash.
Other options listed in the question, such as Vibrio cholerae and Shigella dysenteriae, can also cause intestinal infection and associated symptoms, but they are not specifically known for producing a serious fever as a result of the infection.