National Enteric Disease Surveillance : listeria annual summary, 2013
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    Listeria Initiative Data

    An overview of the Listeria Initiative surveillance system is available at http://www.cdc.gov/listeria/surveillance.html. For this report, a case of invasive listeriosis is defined as isolation of Listeria monocytogenes from a normally sterile

    site (e.g., 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 was obtained from a normally sterile site. For cases in which L. monocytogenes was 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 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 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.

    Reference citation: Centers for Disease Control and Prevention (CDC). National Listeria surveillance annual summary, 2013. Atlanta, Georgia: US Department of Health and Human Services, CDC, 2015.

    CS257475-A

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