Skip directly to search Skip directly to A to Z list Skip directly to navigation Skip directly to page options Skip directly to site content

Case Count Maps

Multistate Outbreak of Listeriosis Linked to Whole Cantaloupes from Jensen Farms, Colorado (FINAL UPDATE)

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 website.

August 27, 2012 (FINAL Update Addendum)

Persons infected with an outbreak-associated subtype of Listeria monocytogenes, by state (n=147 cases reported to CDC as outbreak-associated)*

082712map map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*A total of 147 persons infected with any of the five outbreak-associated subtypes of Listeria monocytogenes were reported to CDC from 28 states. The number of infected persons identified in each state was as follows: Alabama (1), Arkansas (1), California (4), Colorado (40), Idaho (2), Illinois (4), Indiana (3), Iowa (1), Kansas (11), Louisiana (2), Maryland (1), Missouri (7), Montana (2), Nebraska (6), Nevada (1), New Mexico (15), New York (2), North Dakota (2), Oklahoma (12), Oregon (1), Pennsylvania (1), South Dakota (1), Texas (18), Utah (1), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (4).

December 8, 2011

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

120811 map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

* n= 146 for whom information was reported to CDC on December 2, 2011

A total of 146 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes were reported to CDC from 28 states. The number of infected persons identified in each state was as follows: Alabama (1), Arkansas (1), California (4), Colorado (40), Idaho (2), Illinois (4), Indiana (3), Iowa (1), Kansas (11), Louisiana (2), Maryland (1), Missouri (7), Montana (1), Nebraska (6), Nevada (1), New Mexico (15), New York (2), North Dakota (2), Oklahoma (12), Oregon (1), Pennsylvania (1), South Dakota (1), Texas (18), Utah (1), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (4).

November 2, 2011

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

110211 map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n= 139 for whom information was reported to CDC by 9am EDT on November 1, 2011

As of 9am EDT on November 1, 2011, a total of 139 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 28 states.  The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1), California (2), Colorado (39), Idaho (2), Illinois (3), Indiana (3), Iowa (1), Kansas (10), Louisiana (2), Maryland (1), Missouri (6), Montana (1), Nebraska (6), Nevada (1), New Mexico (15), New York (2), North Dakota (2), Oklahoma (11), Oregon (1), Pennsylvania (1), South Dakota (1), Texas (18), Utah (1), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (4).

October 25, 2011

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

Date 10-25-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

* n= 133 for whom information was reported to CDC by 9am EDT on October 24, 2011

As of 9am EDT on October 24, 2011, a total of 133 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 26 states.  All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1), California (2), Colorado (37), Idaho (2), Illinois (3), Indiana (3), Iowa (1), Kansas (10), Louisiana (2), Maryland (1), Missouri (6), Montana (1), Nebraska (6), New Mexico (14), New York (2), North Dakota (1), Oklahoma (11), Oregon (1), Pennsylvania (1), South Dakota (1), Texas (18), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (4).

October 18, 2011

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

Date of 10-18-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=123 for whom information was reported to CDC by 9am EDT on October 17, 2011

As of 9am EDT on October 17, 2011, a total of 123 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 26 states. All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1), California (2), Colorado (36), Idaho (1), Illinois (2), Indiana (3), Iowa (1), Kansas (7), Louisiana (2), Maryland (1), Missouri (4), Montana (1), Nebraska (6), New Mexico (13), New York (2), North Dakota (1), Oklahoma (11), Oregon (1), Pennsylvania (1), South Dakota (1), Texas (18), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (3). Pennsylvania has reported their first case since the last CDC update. Twenty-five deaths have been reported: 6 in Colorado, 1 in Indiana, 2 in Kansas, 2 in Louisiana, 1 in Maryland, 1 in Missouri, 1 in Nebraska, 5 in New Mexico, 2 in New York, 1 in Oklahoma, 2 in Texas, and 1 in Wyoming. Among persons who died, ages range from 48 to 96 years, with a median age of 87 years.  In addition, one woman pregnant at the time of illness had a miscarriage. State and local health departments in these and other states are investigating other listeriosis illnesses to determine if they are part of this outbreak.

October 12, 2011

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

Date of 10-12-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n= 116 for whom information was reported to CDC by 9am EDT on October 11, 2011

As of 9am EDT on October 11, 2011, a total of 116 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 25 states.  All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1), California (1), Colorado (34), Idaho (1), Illinois (1), Indiana (3), Iowa (1), Kansas (7), Louisiana (2), Maryland (1), Missouri (4), Montana (1), Nebraska (6), New Mexico (13), New York (1), North Dakota (1), Oklahoma (11), Oregon (1), South Dakota (1), Texas (17), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (3).  Twenty-three deaths have been reported: 5 in Colorado, 1 in Indiana, 2 in Kansas, 2 in Louisiana, 1 in Maryland, 1 in Missouri, 1 in Nebraska, 5 in New Mexico, 1 in New York, 1 in Oklahoma, 2 in Texas, and 1 in Wyoming. In addition, one woman pregnant at the time of illness had a miscarriage.State and local health departments in these and other states are investigating other listeriosis illnesses to determine if they are part of this outbreak.

October 7, 2011

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

Date 10-07-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n= 109 for whom information was reported to CDC by 9am EDT on October 6, 2011

As of 9am EDT on October 6, 2011, a total of 109 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 24 states.  All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1), California (1), Colorado (32), Idaho (1), Illinois (1), Indiana (2), Iowa (1), Kansas (7), Maryland (1), Missouri (3), Montana (1), Nebraska (6), New Mexico (13), New York (1), North Dakota (1), Oklahoma (11), Oregon (1), South Dakota (1), Texas (16), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (3).  Twenty-one deaths have been reported: 5 in Colorado, 1 in Indiana, 2 in Kansas, 1 in Maryland, 1 in Missouri, 1 in Nebraska, 5 in New Mexico, 1 in New York, 1 in Oklahoma, 2 in Texas, and 1 in Wyoming. In addition, one woman pregnant at the time of illness had a miscarriage. State and local health departments in these and other states are investigating other listeriosis illnesses to determine if they are part of this outbreak.

October 4, 2011

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

Date 10-3-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n= 100 for whom information was reported to CDC by 11am EDT on October 3, 2011

As of 11am EDT on October 3, 2011, a total of 100 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 20 states.  All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1) California (1), Colorado (30), Idaho (1), Illinois (1), Indiana (2), Kansas (7), Maryland (1), Missouri (3), Montana (1), Nebraska (6), New Mexico (13), North Dakota (1), Oklahoma (11), Texas (14), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (2).  Eighteen deaths have been reported: 5 in Colorado, 2 in Kansas, 1 in Maryland, 1 in Missouri, 1 in Nebraska, 5 in New Mexico, 1 in Oklahoma, and 2 in Texas. State and local health departments in these and other states are investigating other listeriosis illnesses to determine if they are part of this outbreak.

September 30, 2011

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

9-30-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=84 for whom information was reported to CDC by 11am EDT on September 29, 2011

As of 11am EDT on September 29, 2011, a total of 84 persons infected with any of the four outbreak-associated strains of Listeria monocytogenes have been reported to CDC from 19 states.  All illnesses started on or after July 31, 2011. The number of infected persons identified in each state is as follows: Alabama (1), Arkansas (1) California (1), Colorado (17), Illinois (1), Indiana (2), Kansas (5), Maryland (1), Missouri (3), Montana (1), Nebraska (6), New Mexico (13), North Dakota (1), Oklahoma (11), Texas (14), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (2).  Fifteen deaths have been reported: 3 in Colorado, 1 in Kansas, 1 in Maryland, 1 in Missouri, 1 in Nebraska, 5 in New Mexico, 1 in Oklahoma, and 2 in Texas. State and local health departments in these and other states are investigating other listeriosis illnesses to determine if they are part of this outbreak.

September 21, 2011

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

Date of 9-21-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=55 for whom information was reported as of 5pm EDT on September 20, 2011

As of 5pm EDT on September 20, 2011, a total of 55 persons infected with the 4 outbreak-associated strains of Listeria monocytogenes have been reported from 14 states.  All illnesses started on or after August 4, 2011. The number of infected persons identified in each state is as follows:  California (1), Colorado (14), Illinois (1), Indiana (1), Maryland (1), Montana (1), Nebraska (4), New Mexico (10), Oklahoma (8), Texas (9), Virginia (1), West Virginia (1), Wisconsin (2), and Wyoming (1).

September 19, 2011

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

Date of 9-19-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=35 for whom information was reported as of September 19, 2011

A total of 35 persons infected with the outbreak-associated strains of Listeria monocytogenes have been reported from 10 states.  All illnesses started on or after August 4, 2011. The number of infected persons identified in each state is as follows:  California (1), Colorado (12), Illinois (1), Indiana (1), Montana (1), Nebraska (4), New Mexico (5), Oklahoma (6), Texas (3), and West Virginia (1).  Listeriosis illnesses in several other states are currently being investigated by state and local health departments to determine if they are part of this outbreak.

September 14, 2011

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

Date of 9-14-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=22 for whom information was reported as of 9/14/2011

A total of 22 persons infected with the outbreak-associated strains of Listeria monocytogenes have been reported from 7 states.  All illnesses started on or after August 15, 2011. The number of infected persons identified in each state is as follows:  Colorado (12), Indiana (1), Nebraska (1), New Mexico (4), Oklahoma (1), Texas (2), and West Virginia (1).  Listeriosis illnesses in several other states are currently being investigated by state and local health departments to determine if they are part of this outbreak.

September 13, 2011

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

Date of 9-13-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=16 for whom information was reported as of 9/13/2011

A total of 16 persons infected with the outbreak-associated strains of Listeria monocytogenes have been reported from 5 states.  All illnesses started on or after August 15, 2011. The number of infected persons identified in each state is as follows:  Colorado (11), Indiana (1), Nebraska (1), Oklahoma (1), and Texas (2).  Listeriosis illnesses in several other states are currently being investigated by state and local health departments to determine if they are part of this outbreak.

September 12, 2011

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

Date of 9-12-2011 chart and map showing persons infected with the outbreak strain of Listeria monocytogenes, by state

*n=15 for whom information was reported as of 9/12/2011

A total of 15 persons infected with the outbreak strain of Listeria monocytogenes have been reported from 4 states. All illnesses started on or after August 15, 2011. The number of infected persons identified in each state is as follows:  Colorado (11), Nebraska (1), Oklahoma (1), and Texas (2). Listeriosis illnesses in several other states are currently being investigated by state and local health departments to determine if these illnesses are part of this outbreak.
Top