A Department of Health spokeswoman said: Locally, [the Department of] Environmental Health will be contacting food suppliers to follow up.
The strain of E. coli contaminating the lettuce is the same that caused a similar outbreak previous year, prompting questions about why the federal government has stopped short of issuing a mandatory recall.
"If inspectors observe romaine being sold, they will order the establishment to dispose of the product", Health Department spokesman Michael Lanza said.
Public health investigators are using the PulseNet system to identify illnesses that may be part of this outbreak.
Under the Consumer Protection Act, consumers are therefore to refrain from purchasing or consuming imported Romaine lettuce until further notice.
Dillons spokeswoman Sheila Lowrie said Wednesday morning all romaine and products containing it were pulled from the grocer's shelves overnight.
The Ottawa resident -described by Ottawa Public Health as an adult under the age of 65 - did not report consuming romaine lettuce, although the person's infection has been confirmed to be connected to the outbreak in Ontario, Quebec and several US states.
"I think that the issue isn't that there's more unsafe food", Gottlieb said. Typical symptoms include stomach cramps, diarrhea and vomiting. People in the spring outbreak were infected with E. coli O157:H7 bacteria with a different DNA fingerprint. There is no real treatment for E. coli infections, other than monitoring the illness, providing comfort, and preventing dehydration through proper hydration and nutrition.
Most symptoms end within five to ten days.
"They can actually do more harm than good", said Bogoch.
Under normal circumstances, health officials often advise people to throw away the outer leaves of romaine lettuce and wash the rest.
He added they wanted to get out the warning before people prepared their Thanksgiving meals, so limit the risk of further infections. "Most of the romaine lettuce being harvested right now is coming from the California region, although there's some lettuce coming in from Mexico".