Federal health officials are probing a Listeria monocytogenes outbreak with 25 confirmed cases. The FDA has not identified contaminated foods or begun inspections. Listeria can cause severe, sometimes life-threatening illness, with symptoms like nausea, vomiting, fever, muscle aches, headache, and neck stiffness. Symptoms may appear up to 70 days after exposure, and diagnosis requires lab testing.
New Listeria outbreak detected; FDA continues work on other investigations
