In July of 2014, a California packing house
recalled stone fruit due to Listeria that was discovered through testing. There were no illnesses reported at the time.
CDC took the PFGE patterns from the Listeria isolated at the peach facility and matched against human cases of Listeria infection across the country. Two cases, one in Minnesota and one in Massachusetts had matching patters and had eaten fruit that may have come from the company.
If the connection is truly there, this would be the first cases of listeriosis from stone fruit.
But what about the scenario here? Basically FDA (or USDA) isolates Listeria from a product followed by the CDC running the isolate's DNA patter through their database to match that bacteria’s DNA pattern with
any cases of illness that have occurred across the country . Then in those cases where there is a DNA match, they happen to find that person ate (or may have ate) that product at some point, then that food would be implicated. But was it really the food that resulted in the illness? Or is it circumstantial evidence? Could that person have eaten another item that contained that specific strain of Listeria?
CDC MMWR
http://www.cdc.gov/mmwr/preview/mmwrhtml/mm6410a6.htm?s_cid=mm6410a6_e
Notes from the Field: Listeriosis Associated with Stone Fruit — United States, 2014
Weekly
March 20, 2015 / 64(10);282-283
Brendan R. Jackson, MD1, Monique Salter, MPH2, Cheryl Tarr, PhD1, Amanda Conrad, MPH1,3, Emily Harvey4, Lisa Steinbock5, Amy Saupe, MPH6, Alida Sorenson, MPH7, Lee Katz, PhD1, Steven Stroika1, Kelly A. Jackson, MPH1, Heather Carleton, PhD1, Zuzana Kucerova, MD, PhD1, David Melka2, Errol Strain, PhD2, Mickey Parish, PhD2, Rajal K. Mody, MD1 (Author affiliations at end of text)
On July 19, 2014, a packing company in California (company A) voluntarily recalled certain lots of stone fruits, including whole peaches, nectarines, plums, and pluots, because of concern about contamination with Listeria monocytogenes based on internal company testing (1). On July 31, the recall was expanded to cover all fruit packed at their facility during June 1–July 17 (2). After the initial recall, clinicians, state and local health departments, CDC, and the Food and Drug Administration (FDA) received many inquiries about listeriosis from concerned consumers, many of whom had received automated telephone calls informing them that they had purchased recalled fruit. During July 19–31, the CDC Listeria website received >500,000 page views, more than seven times the views received during the previous 52 weeks. However, no molecular information from L. monocytogenes isolates was available to assess whether human illnesses might be linked to these products.