Is Salmonella gram-positive or negative?

Salmonella:

1. In the field of bacteriology, gram-positive bacteria are those that exhibit a positive reaction to the gram stain test, which has been used for centuries to quickly divide bacteria into two groups based on the nature of their cell walls.
2. Gram-negative bacteria do not retain the crystal violet stain employed in the gram staining method of bacterial differentiation.
3. Gram-negative, flagellated, facultatively anaerobic Salmonella species are bacilli with O, H, and Vi antigens.
4. Three main antigens—the H or flagellar antigen, the O or somatic antigen, and the Vi antigen—are present in the gram-negative, flagellated, facultatively anaerobic bacilli known as salmonellae (possessed by only a few serovars).
5. H antigen can appear in either one or both of phases 1 and 2 or both.
6. Salmonella typhi, a potentially harmful organism, is what causes typhoid fever.
7. The bacteria that cause salmonellosis, another deadly intestinal infection, is linked to salmonella typhi, but they are not the same.
8. Salmonella is gram-negative.