How do you prevent salmonella?

You can't really do it by yourself; salmonella does not have obvious indicators like taste, color or smell. You'd basically need to send it out to a lab to have them test it. Of course, the painful way to detect it is after ingesting: stomach pain, vomiting, diarrhea, nausea, fever and chills, all of which can be cured with antibiotics if caught in time. If not, you could die -- so get to a hospital if you think you've got it, and play it safe by throwing away or fully cooking risky foods, which kills it.