Case Count Maps

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

Posted November 21, 2012 2:30 PM 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.

Current Case Count Map

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by state*

Persons infected with the outbreak-associated strain of Listeria monocytogenes, by state

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

A total of 22 persons infected with the outbreak-associated strain of Listeria monocytogenes were reported from 13 states and the District of Columbia. The number of ill persons identified in each state was as follows: California (3), Colorado (1), District of Columbia (1), Maryland (3), Massachusetts (1), Minnesota (1), Nebraska (1), New Jersey (3), New Mexico (1), New York (1), Ohio (1), Pennsylvania (2), Virginia (2), and Washington (1).