A Listeria outbreak has killed one and made at least 10 others dangerously ill. Three of those that are ill are babies, but it is not clear as of now if the death was also a baby. The lysteria-linked death occured in California, and seven of the other illnesses were in Maryland.

The outbreak has been linked to hispanic-style cheeses bought at different locations of the same grocery chain which will remain nameless pending the investigation. However, the cheeses themselves were “likely produced by” Roos Foods of Kenton, Deleware, according to AP.

The illnesses were actually reported between August and November of last year, but the CDC cautions that there could be more that are unknown as of now. They also warn against buying or eating any cheese produced by Roos Foods and repackaged at a local grocery chain. Roos Foods cheeses are sold under the brand names Santa Rosa de Lima, Amigo, Mexicana, Suyapa, La Chapina, and La Purisima Crema Nica.

Listeria is a serious illness that causes fever and muscle aches, usually with serious diarrhea. The illness is very dangerous to newborns as well as pregnant women since the disease can easily pass from a mother to her unborn child.

Listeria is usually found in places like soil, dust, water, sewage, and unpasteurized cheeses such as brie, mozzarella, and blue cheese. It can also be found in uncooked fruits and vegetables. Listeria infection can lead to bacterial meningitis, usually in newborns and those with impaired immune systems. Bacterial meningitis can actually become contagious among people in close contact, and can lead to death.

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