In early March 2017, public health and regulatory officials in several states, the Centers for Disease Control and Prevention (CDC), and the US Food and Drug Administration (FDA) investigated an outbreak of Listeria monocytogenes(Listeria) infections. Investigators used epidemiologic evidence and laboratory results from the PulseNet system to identify case patients who were part of the outbreak. Eight people infected with outbreak strain of Listeria were reported from four states, New York, Connecticut, Vermont and Florida. The Florida case had traveled to New York in the month before illness onset. Whole genome sequencing (WGS) performed on clinical isolates from all 8 case-patients showed that the isolates were closely related genetically, providing strong support that illnesses were linked to a common source.
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