Following Blue Bell’s recall of all of their products last night, CDC updated their Blue Bell Creameries investigation website to include two additional illnesses in Arizona and Oklahoma (in 2010 and 2012).

As of April 21, 2015, a total of ten patients infected with several strains of Listeria monocytogenes were reported from four states: Arizona (1), Kansas (5), Oklahoma (1), and Texas (3). Illness onset dates ranged from January 2010 through January 2015. The patients with illness onsets ranging from 2010-2014 were identified through a retrospective review of the PulseNet database for DNA fingerprints that were similar to isolates collected from Blue Bell ice cream samples. Since the last update on April 8, 2015, two additional patients, one each from Arizona and Oklahoma, were confirmed to be a part of the outbreak by whole genome sequencing. All ten (100%) patients were hospitalized. Three deaths were reported from Kansas.

What we haven’t heard from Blue Bell is whether they had Listeria issues in their plants in the past, and if so, what they did to address them.