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Epi Curves

Multistate Outbreak of Multidrug-Resistant Salmonella Heidelberg Infections Linked to Foster Farms Brand Chicken (Final Update)

Posted July 31, 2014 4:00 PM ET

This outbreak appears to be over. However, Salmonella is an important cause of human illness in the United States. More information about Salmonella, and steps people can take to reduce their risk of infection, can be found on the CDC Salmonella Web Page.

Final Epi Curve

This outbreak can be visually described with a chart showing the number of persons who became ill each day. This chart is called an epi curve. Please see the Timeline for Reporting of Salmonella Cases for more details on the reporting process.

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

7-31-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=633 for whom information was reported as of July 24, 2014

Illnesses that began after June 2, 2014, might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

July 4, 2014

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

7-31-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=620 for whom information was reported as of July 2, 2014

Illnesses that began after June 2, 2014, might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

May 27, 2014

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

5-27-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=560 for whom information was reported as of May 22, 2014

Illnesses that began after April 22, 2014, might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

April 9, 2014

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

4-9-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=518 for whom information was reported as of April 4, 2014

Illnesses that began after March 8, 2014, might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

March 3, 2014

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

3-3-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=472 for whom information was reported as of February 28, 2014

The number of reported infections from all seven outbreak strains of Salmonella Heidelberg returned to baseline levels in January and the outbreak appeared to be over, as noted in the previous update on January 16, 2014. However, the investigation continued and ongoing surveillance in February identified that infections from two of the previously rare outbreak strains have again exceeded the number of infections expected to be reported to PulseNet during this time of year. Illnesses that occurred after January 29, 2014, might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

January 16, 2014

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

1-16-2014 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=430 for whom information was reported as of January 15, 2014

The number of reported infections from the outbreak strains of Salmonella Heidelberg has returned to baseline levels indicating that this particular outbreak appears to be over. However, activities related to this investigation are ongoing. Illnesses that occurred after December 15, 2013 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

December 18, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

12-18-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=403 for whom information was reported as of December 18, 2013

Illnesses that occurred after November 17, 2013 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

November 19, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

11-19-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=380 for whom information was reported as of November 15, 2013

Illnesses that occurred after October 14, 2013 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

October 30, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

10-30-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=356 for whom information was reported as of October 29, 2013

Illnesses that occurred after September 28, 2013 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

October 18, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

10-18-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=332 for whom information was reported as of October 17, 2013

Illnesses that occurred after September 16, 2013 might not be reported yet due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

October 11, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

10-11-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=310 for whom information was reported as of October 11, 2013

Illnesses that occurred after September 5, 2013 might not yet be reported due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

October 7, 2013

Persons infected with the outbreak strains of Salmonella Heidelberg, by week of illness onset*

10-7-2013 Epi Curve: Persons infected with the outbreak strain of Salmonella Heidelberg, by date of illness onset

*n=274 for whom information was reported as of October 7, 2013

Illnesses that occurred after September 1, 2013 might not yet be reported due to the time it takes between when a person becomes ill and when the illness is reported. This takes an average of 2 to 4 weeks.

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