County of Los Angeles
Department of Public Health
Acute Communicable Disease Control
313 N. Figueroa Street, #212
Los Angeles, CA 90012
Phone: (213) 240-7941
Fax: (213) 482-4856
Email:acdc2@ph.lacounty.gov
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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. 
Public Health has made reasonable efforts to provide accurate translation. However, no computerized translation is perfect and is not intended to replace traditional translation methods. If questions arise concerning the accuracy of the information, please refer to the English edition of the website, which is the official version.
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