A total of eight persons infected with the outbreak strain of Listeria monocytogenes were reported from California (1) and Maryland (7)
Seven of eight ill persons were hospitalized. One death was reported in California. Five of the illnesses (2 mother-newborn pairs and a newborn) were related to pregnancy.
All patients are of Hispanic ethnicity.
Virginia’s Division of Consolidated Laboratory Services (DCLS) identified the outbreak strain of Listeria monocytogenes in a sample of Caujada en Terron (fresh cheese curd) collected by the Virginia Department of Agriculture and Consumer Services (VDACS) from a Chain A store. This cheese was likely produced by Roos Foods of Kenton, Delaware and was later repackaged in the Chain A store. VDACS issued a press release on February 15, 2014 instructing persons who purchased this product not to consume the cheese and to discard any remaining product.
VDACS subsequently collected pre-packaged Caujada en Terron produced by Roos Foods from Chain A that was not repackaged in the store. The Virginia DCLS identified Listeria monocytogenes from these samples; a consumer advisory was issued on February 21, 2014. DNA fingerprinting and whole-genome sequencing will be performed on these isolates. In addition, the Maryland Department of Health and Mental Hygiene has tested samples of pre-packaged cheese products purchased at Chain A stores; those products produced by Roos Foods are preliminarily positive for Listeria monocytogenes. On February 19, 2014, the Maryland Department of Health and Mental Hygiene issued a warning to consumers to not eat any cheese products made by Roos Foods. Their warning stated that Roos Foods cheese products are sold under brand names Santa Rosa de Lima, Amigo, Mexicana, Suyapa, La Chapina, and La Purisima Crema Nica.