• According to the Mayo Clinic, salmonella infections are most often caused by bacteria often found in undercooked meat, poultry or eggs. If the bacteria that causes a salmonella infection comes into contact with peanut butter and that peanut butter is eaten, a number of uncomfortable and, in some cases, dangerous symptoms can occur as a result of salmonella poisoning.
  
  

Gastrointestinal Symptoms

• Gastrointestinal problems are a common symptom of salmonella infection. If an individual eats peanut butter tainted with salmonella, he may experience diarrhea, nausea, vomiting and stomach pains. Some individuals with salmonella poisoning will notice blood in their feces. An individual with a salmonella infection caused by peanut butter should try to prevent dehydration from the loss of fluids caused by gastrointestinal upset.
  
  

Aches and Pains

• A salmonella infection caused by eating tainted peanut butter can cause an individual to experience discomfort. A headache, stomachache and muscle pains throughout the body may develop in an individual with salmonella poisoning.
  
  

Other Symptoms

• In addition to gastrointestinal upset and body aches, an individual with a salmonella infection caused by eating tainted peanut butter may also develop a fever and experience the chills.