You are likely thinking of Salmonella Typhi, which is the bacterium that causes typhoid fever.

* Salmonella Typhi is a gram-negative, facultative anaerobic bacterium that infects humans and causes typhoid fever.

* Bacillus is a genus of bacteria that includes many species, but not Salmonella Typhi.

It's important to use the correct scientific name to avoid confusion and ensure accurate information.