All items containing romaine lettuce in Sobeys' national store network - over 300 products - are being removed from shelves at Sobeys, Safeway, IGA, Thrifty Foods, Foodland, FreshCo and Lawton's Drug Stores as well as all Sobeys Inc. convenience store banners in all provinces.
Two cases were in Illinois, neither of which resulted in hospitalization, according to the Illinois Department of Public Health.
In a news release posted on its website, Loblaw also said its stores would provide "a full refund" if customers returned the products.
"If a specific brand and/or source of romaine lettuce or other product is identified in the investigation, CFIA will take appropriate action".
No deaths have been reported so far but 32 cases of food poisoning were reported across 11 states in the USA, with 13 people hospitalised and one patient developing a form of kidney failure. "I think food safety should take priority".
"We have the technology today to be able to trace it back", she added, referring to blockchain technology that allows people along the supply chain to securely enter information that can be accessed quickly in case of an emergency. Those most at risk for developing complications are pregnant women, people with weakened immune systems, young children and seniors.
Symptoms of salmonella infection can include diarrhea, abdominal cramps, and fever, and can sicken otherwise healthy adults for as much as a week. Symptoms can show up anywhere from one to 10 days after exposure, the CDC says.
"They can actually do more harm than good", said Bogoch.
A common source of E. coli illness is raw fruits and vegetables that have come in contact with feces from infected animals. Most forms of the bacteria are harmless. Romaine also grows loosely, unlike iceberg lettuce, which has a more contained head, potentially increasing the likelihood of contamination, she said.
But as of 11.20pm on Wednesday (Nov 21) local time, neither the Agri-Food and Veterinary Authority of Singapore (AVA) nor the US Centres for Disease Control and Prevention (CDC) had issued a recall for romaine lettuce.