Listeriosis Outbreak in Maryland and California From Roos Cheese
February 22, 2014 by
Linda Larsen
The Centers for Disease Control and Prevention (
CDC) has started an investigation into an outbreak of listeriosis, caused by the
Listeria monocytogenes
bacteria, in Maryland and California. One person in California was
sick and died, and seven people are ill in Maryland. All seven people in
Maryland have been hospitalized in this outbreak.

Five
of the illnesses, two mother-newborn pairs and a newborn, were related
to pregnancy. All of the patients are Hispanic. All patients in Maryland
reported consuming soft or semi-soft Hispanic-style cheese and all
shopped at different locations of the same food store. At this time, the
CDC is identifying the store only as Chain A. Testing of cheese
products collected from Chain A stores in Maryland and Virginia found
the outbreak strain of bacteria.
The cheese is identified as Caujada en Terron (fresh cheese curd),
produced by Roos Foods of Kenton, Delaware. That cheese was recalled on
February 15, 2014, and consumer advisories and
warnings about
Roos cheese products were issued on February 19 and February 21, 2014.
The cheese was repackaged in the Chain A store. Listeria monocytogenes
was found in the cheese before it was repackaged. Pre-packaged cheese
products at Chain A stores, by Roos Foods, have tested “preliminarily
positive” for Listeria monocytogenes.
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