Not everyone who ingests Salmonella bacteria will become ill. Children, especially infants, are most likely to get sick from it. Because many different illnesses can cause similar symptoms (such as nausea, fever, cramping, and diarrhea), doctors may send a stool (poop) sample to the lab for testing. A severe Salmonella infection will require more testing to see which specific germ is causing the illness and which antibiotics can be used to treat it. In higher-risk groups, most doctors will treat an infection with antibiotics to prevent it from spreading to other parts of the body. Antibiotics do not appear to help a healthy person whose infection is not severe and may actually lengthen the amount of time the person will carry the bacteria.