CDC, public health and regulatory officials in several states, and the U.S. Food and Drug Administration (FDA) investigated a multistate outbreak of Listeria monocytogenes infections. Epidemiologic data showed that leafy greens were a likely source of the outbreak. However, there was not enough other data to identify a specific type or producer of leafy greens.
As of June 13, 2023, a total of 19 people infected with the outbreak strain of Listeria were reported from 16 states. Sick people’s samples were collected from July 3, 2018, to March 31, 2023.
Public health officials collected many different types of information from sick people, including their age, race, ethnicity, other demographics, and the foods they ate in the month before they got sick. This information provided clues to help investigators identify the source of the outbreak.
Sick people ranged in age from less than 1 to 96 years, with a median age of 72, and 63% were female. Among 19 people with race information available, 17 people were White, 1 was African American/Black, and 1 reported “Other” race. Among 19 people with ethnicity information available, two people were Hispanic. Eighteen people were hospitalized, and no deaths were reported.
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