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Epi Curves

Multistate Outbreak of Listeriosis Linked to Roos Foods Dairy Products (Final Update)

Posted April 18, 2014 9:30 AM ET

This investigation is closed.Listeria monocytogenes infection (listeriosis) is an important cause of illness in the United States. More information about listeriosis, and steps people can take to reduce their risk of infection, can be found on the CDC Listeria Web Page.

Final Epi Curve

This outbreak can be visually described with a chart showing the number of people who were diagnosed each month. This chart is called an epi curve.

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by date of clinical specimen collection*

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by date of clinical specimen collection as of April 1, 2014

*8 persons were ill with the outbreak strain of Listeria monocytogenes.  Two mother-newborn pairs (4 ill persons) are each represented by a single clinical specimen collection date.

Previous Epi Curve - February 21, 2014

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by date of clinical specimen collection*

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by date of clinical specimen collection as of February 21, 2014

*8 persons were ill with the outbreak strain of Listeria monocytogenes.  Two mother-newborn pairs (4 ill persons) are each represented by a single clinical specimen collection date.

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