The Centers for Disease Control and Prevention has  confirmed 23 cases of listeriosis in ten states.  Investigations and interviews have implicated Big Olaf Creamery ice cream products as a potential vehicle of infection.  The manufacturer is voluntarily advising retailers not to sell products from their plant. 

Whole genome sequencing showed close genetic similarity among isolates from patients suggesting a common source.  Cases ranged in onset from January 24th 2021 through June 12th 2022.

This outbreak is eerily reminiscent of the 2018 case involving Blue Bell Creamery. FDA has yet to establish direct traceback from patients to contamination in the Big Olaf plant or in unopened containers of ice cream.