County of Los Angeles
Department of Public Health
Acute Communicable Disease Control
313 N. Figueroa Street, Room 212
Los Angeles, CA 90012
Phone: (213) 240-7941
Fax: (213) 482-4856
E-Mail:acdc2@ph.lacounty.gov
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Acute Communicable Disease Control
Listeriosis, Perinatal
Perinatal listeriosis is a disease transmitted transplacentally from infected pregnant women;
these women may experience only mild flu-like symptoms or may be asymptomatic. A perinatal
listeriosis case is defined as a mother-infant pair in which one or both persons has a positive
Listeria monocytogenes culture from a normally sterile site. Neonatal/infant listeriosis is often
divided into early onset (0–6 days after birth) and late onset (7–42 days after birth). Infection
during pregnancy may lead to premature birth, stillbirth, or septicemia and/or meningitis in the
neonate—even if the mother is asymptomatic. There is no vaccine to prevent listeriosis.
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.
Perinatal listeriosis is a disease transmitted transplacentally from infected pregnant women;
these women may experience only mild flu-like symptoms or may be asymptomatic. A perinatal
listeriosis case is defined as a mother-infant pair in which one or both persons has a positive
Listeria monocytogenes culture from a normally sterile site. Neonatal/infant listeriosis is often
divided into early onset (0–6 days after birth) and late onset (7–42 days after birth). Infection
during pregnancy may lead to premature birth, stillbirth, or septicemia and/or meningitis in the
neonate—even if the mother is asymptomatic. There is no vaccine to prevent listeriosis.
