The Washington Department of Health (DOH), the Tacoma-Pierce County Health Department, and Thurston County Public Health and Social Services investigated an outbreak of Listeria monocytogenes in July and August 2023. Six cases of listeriosis were reported by August 9, 2023. This cluster was given the outbreak code 2306WAGX6-1.
Cases ranged from 43 to 79 years (median 63.5). Sixty percent (60%) were male. Five of the six cases had serious underlying health conditions, which put them at high risk for Listeria infection. All six were hospitalized, and three out of these six cases have died. Illnesses ranged from February 27 to July 22, 2023. These cases were residents of Pierce (5) and Thurston (1) County.
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