Question: how soon can you tell if you have listeria?
Answer: How will I know if I have listeriosis? Symptoms of listeriosis may show up 2-30 days after exposure. Symptoms in pregnant women include mild flu-like symptoms, headaches, muscle aches, fever, nausea, and vomiting. If the infection spreads to the nervous system it can cause a stiff neck, disorientation, or convulsions.