"Based on the ongoing US outbreak, and the information provided by individuals who became sick, the likely source of the outbreak in Canada is romaine lettuce", the agency said.
On May 9, the Centers for Disease Control and Prevention (CDC) shared its latest update on the romaine lettuce outbreak, adding additional victims and states to the existing list. The agency says the last illness started back on April 25, and that "illnesses that occurred in the last two to three weeks might not yet be reported".
There have been a total of 149 cases and 64 people have been hospitalized so far, including 17 people facing kidney failure.
The United States Food and Drug Administration has been notified by the Department of Agriculture in Arizona that a halt has been called on the growing of romaine lettuce in Yuma and surrounding areas.
It's hard to predict how long this outbreak might go on, or how many more cases are likely to be reported. These include stomach cramps, diarrhea, and vomiting.
As of April, eight people from Idaho had gotten sick from E. coli. Sixty-four people have been hospitalized and one person in California has died.
Symptoms of E. coli begin on average three to four days after the bacteria are consumed.
Most people recover within the first week, according to the CDC, but some infections can be severe.
As delicious as Caesar Salad is, it would be advisable - at least for the moment- to switch out romaine for another type of lettuce.
When health officials say numbers are increasing, most often it reflects how they've taken a sample from an ill person, done DNA testing and had the person say yes to eating romaine.
Typically in winter, romaine lettuce is grown in Arizona because it has the right temperature.
Although the current outbreak has stretched on for nine weeks, the CDC still hasn't identified the contamination source or where all of the suspect lettuce was grown.
Products containing romaine lettuce often don't indicate growing regions, so it could be hard for consumers to tell whether the vegetable they're buying is tainted with bacteria.