Timeline of Reported Cases

Final Update

Posted January 15, 2020 at 3:00 PM ET

This outbreak appears to be over. CDC is no longer advising that people avoid romaine lettuce from the Salinas Valley growing region in California. E. coli is an important cause of illness in the United States. More information about E. coli, and steps people can take to reduce their risk of infection, can be found on the E. coli and Food Safety web page.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of January 15, 2020.

*n=167 for whom information was reported as of January 13, 2020. Some illness onset dates have been estimated from other reported information.

Previous Timelines

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of December 19, 2019

*n=138 for whom information was reported as of December 17, 2019.

Illnesses 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.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of December 2, 2019

*n=102 for whom information was reported as of December 2, 2019.

Illnesses 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.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of November 25, 2019

*n=67 for whom information was reported as of November 25, 2019.

Illnesses 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.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of November 22, 2019

*n=40 for whom information was reported as of November 21, 2019.

Illnesses 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.

People infected with the outbreak strain of E. coli O157:H7, by date of illness onset*

Epi curve of people infected with the outbreak strain of E. coli, by date of illness onset, as of November 19, 2019

*n=17 for whom information was reported as of November 18, 2019. Illnesses 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 two to four weeks.