The food-safety experts at Consumer Reports are advising consumers to avoid romaine all together and any products with romaine in them - such as salad blends and mixes - until the cause is found, identified and removed from store shelves.
To be on the safe side, Consumer Reports suggests throwing out any romaine lettuce you may have in your fridge.
"There appears to be an ongoing risk of E. coli infections associated with the consumption of romaine lettuce in Canada's eastern provinces", Canada said on December 28.
With the investigation ongoing the CDC is not recommending people avoid any particular food at this time. Canadian authorities declared their outbreak over on Wednesday.
Preliminary testing on isolates from patient in both countries has shown the bacteria that caused the illness are related, meaning that there is likely a common source.
The CDC said the likely source of the US outbreak appears to be leafy greens, but it is not recommending Americans avoid any particular food at this time. Attorney Fred Pritzker and his team recently won $7.5 million for young client whose kidneys failed because of hemolytic uremic syndrome after an E. coli O157:H7 infection.
The cases occurring in both the US and Canada are of the same strain and appear to share a genetic fingerprint, CNN reported, but the CDC said this was not sufficient data to prove a link.
While FDA has been largely silent about the outbreak while the investigation continues, FDA Commissioner Scott Gottlieb tweeted about the outbreak this week.
Jean Halloran, director of Food Policy Initiatives at Consumers Union, said it's unclear what steps FDA and CDC are taking in the wake of one of the most serious outbreaks that has occurred in the Trump administration.
And some companies are not waiting to act.
"To avoid any confusion and in an abundance of caution, we have temporarily removed romaine lettuce from our restaurants in the USA and Canada", said Heidi Schauer, Wendy's spokeswoman.
Illnesses started on dates from November 15 through December 12, 2017.