The CDC reports this morning that as of December 30, 2014, a total of 32 people infected with the outbreak strains of Listeria monocytogenes have been reported from 11 states: Arizona (4), California (2), Minnesota (4), Missouri (5), Nevada (1), New Mexico (6), North Carolina (1), Texas (4), Utah (1), Washington (1), and Wisconsin (3). Dates when the Listeria strains were isolated range from October 17, 2014, to December 11, 2014. Ten illnesses have been associated with a pregnancy (occurred in a pregnant woman or her newborn infant). One fetal loss has been reported. Among people whose illnesses were not associated with a pregnancy, ages ranged from 7 to 92 years, with a median age of 66 years, and 32% were female. Three invasive illnesses (meningitis) occurred among otherwise healthy children aged 5–15 years. Thirty-one ill people have been hospitalized and six deaths have been reported. Listeriosis contributed to three of these deaths, and it is unclear whether it contributed to an additional two deaths. The sixth death was unrelated to listeriosis.
The Public Health Agency of Canada (PHAC) has identified 2 cases of listeriosis in Canada with the same PFGE patterns as seen in the US outbreak. PHAC is working with its provincial and territorial partners to determine the source of these illnesses.