National Enteric Disease Surveillance : listeria annual summary, 2011
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    An overview of the Listeria Initiative surveillance system is available at For this report, a case of invasive listeriosis is defined as isolation of Listeria monocytogenes from a normally sterile site (e.g., blood or cerebrospinal fluid [CSF]) or from products of conception (e.g., amniotic fluid, placental or fetal tissue). For cases in which L. monocytogenes is isolated from multiple anatomical sites, the case is considered to be invasive if any isolate is obtained from a normally sterile site. For cases in which L. monocytogenes is isolated from multiple normally sterile anatomical sites, the annual summary reports the most invasive site, using a hierarchy (in descending order of invasiveness: CSF, bone or joint fluid, blood, other sterile site, and other products of conception). Each mother-infant pair in episodes of pregnancy-associated listeriosis is reported as a single case, even when clinical isolates are obtained from both the mother and the infant. The rationale is that an episode of pregnancy-associated listeriosis inherently involves both the mother and the infant, because the infant's infection, in most if not all cases, occurs because the mother ate contaminated food. Cases are classified as pregnancy-associated if illness occurs in a pregnant woman or infant <̲28 days old; all other cases are considered to not be associated with pregnancy.
  • Content Notes:
    January 2013.


    Available via the World Wide Web as an Acrobat .pdf file (275.83 KB, 7 p.).

    Includes bibliographical references (p. 7).

    Centers for Disease Control and Prevention (CDC). National Listeria Surveillance Annual Summary, 2011. Atlanta, Georgia: US Department of Health and Human Services, CDC, 2013.

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