Acute Communicable Disease Control
Listeriosis, Nonperinatal

Listeriosis is a disease transmitted primarily through consumption of food contaminated with Listeria monocytogenes, a gram-positive bacterium. L. monocytogenes is found in soil and water, and can contaminate raw foods (e.g., uncooked meats and vegetables), as well as processed foods that become contaminated after processing (e.g., soft cheeses and cold cuts). Unpasteurized (raw) milk and foods made from unpasteurized milk may also contain the bacterium. Common symptoms of listeriosis include fever, muscle aches, headache, nausea, diarrhea, and neck stiffness. A case of nonperinatal listeriosis is one that occurs in persons other than pregnant women and/or their fetuses, neonates, or infants up to 42 days after birth. Historically, nonperinatal listeriosis presents as meningoencephalitis and/or septicemia, primarily affecting elderly and immunocompromised persons, such as those with cancer or HIV, and those on immunosuppressive therapy.

Additional Resources Publications & Archives
  • Listeriosis Brochure: English / Spanish
  • Listeriosis: Are you pregnant? 11"x17" Poster: English / Spanish
  • Order Form: Brochures or Poster
  • Queso Fresco - Safe Cheese and Unsafe Cheese: English / Spanish

    Clarification: "Ranchero" is a trademark of the Cacique company, in Industry, California.
    Cacique's "Ranchero" is made with pasteurized milk.
    Any raw milk cheese advisory is not intended to include this Cacique product.