The immune system's response to salmonella:

1. Salmonella bacteria enters the body, most likely from contaminated food.
2. White blood cells go "oh no! an invader! send out the T cells! Send out the B cells!"
3. The T and B cells replicate themselves. Two types of B cells are created. One to attack this salmonella invasion, the other to remeber salmonella so if it comes again it will be killed wuickly.
4. The T cells release natural killer cells and mark salmonella and all cell it has infected for destruction.
5. Macrophages and neutrophils attack he salmonella, and secrete interleukin-1 alarm signals, which more T cells respond to by starting the cell mediated response.
6. The B cells created, which are special to salmonella, make salmonella-only antibodies. (illustration)
7. The antibodies attach to the salmonella cells, disabling them and allowing others (cytotoxic T's, neutrophils, macrophages, and natural killers) to kill them, ridding the body of salmonella.
8. Life is peachy.