National Enteric Disease Surveillance : the Listeria Initiative
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      Listeria monocytogenes is estimated to cause about 1,600 illnesses each year in the United States with more than 1,500 related hospitalizations and 260 related deaths (1). Listeria infections (listeriosis) are nationally notifiable. Nearly all cases in persons who are not infants result from eating food contaminated with L. monocytogenes; newborn infants can develop listeriosis if their mothers ate contaminated food during pregnancy.

      The Listeria Initiative is an enhanced surveillance system that collects reports of laboratory-confirmed cases of human listeriosis in the United States. Demographic, clinical, laboratory, and epidemiologic data are collected using a standardized, extended questionnaire. The Listeria Initiative was piloted in the Foodborne Diseases Active Surveillance Network (FoodNet) in 2004 and implemented nationwide in 2005. The number of states participating increased to 47 states and the District of Columbia by 2014. The proportion of all listeriosis cases reported to the Listeria Initiative continues to increase.



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