320 Listeria, Listeriosis, and Food Safetypopulation, compared to 0.3/100,000 during the preceding 11 months. Among 36 cases identified during the epidemic period, 32 occurred in nonpregnant adults (75% had underlying conditions resulting in immuno suppression) and 4 were perinatal. The case-fatality rate was higher than that for most outbreaks; 44% of patients, including 2 neonates, died. Also uncharacteristic of other outbreaks of invasive listeriosis, 35% of patients reported having diarrhea during the week beforetheir illness was diagnosed
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