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Posted November 21, 2012 2:30 PM ET

Multistate Outbreak of Listeriosis Linked to Imported Frescolina Marte Brand Ricotta Salata Cheese (Final Update)

This outbreak appears to be over. 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.

Current Epi Curve

This outbreak can be visually described with a chart showing the number of persons who were diagnosed each week. 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

*n=22 for whom information was reported as of November 14, 2012

« Read the full Outbreak Investigation

Previous Epi Curves

Epi Curve: October 25, 2012

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 October 25, 2012

*n=22 for whom information was reported as of October 25, 2012. Clinical specimens that were collected after October 8, 2012 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported.

Epi Curve: October 11, 2012

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 October 11, 2012

*n=20 for whom information was reported as of October 11, 2012. Clinical specimens that were collected after September 24, 2012 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported.

Epi Curve: September 26, 2012

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 September 26, 2012

*n=18 for whom information was reported as of September 26, 2012. Clinical specimens that were collected after September 8, 2012 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported.

Epi Curve: September 20, 2012

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 September 20, 2012

*n=15 for whom information was reported as of September 20, 2012. Clinical specimens that were collected after September 4, 2012 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported.  

Epi Curve: September 11, 2012

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 September 11, 2012

*n=14 for whom information was reported as of September 11, 2012. Clinical specimens that were collected after August 26, 2012 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported.  

 
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