Reduction in the incidence of human listeriosis in the United States.

Evaluates the impact of prevention efforts against human listeriosis in the United States. Food-borne transmission as a major cause human listeriosis; Identification of cases in which Listeria monocytogenes was isolated from cultures or ordinarily sterile sites in an aggregate population of more than 19 million; Cases of perinatal and nonperinatal listeriosis.