Health Canada has just issued a warning to residents of Ontario and Quebec to stop consuming romaine lettuce.\nALSO READ: 5 Signs That Marijuana Legalization Is Not Working In Canada\nFeatured in Anchorman Canada\nTL;DR Romaine lettuce has been linked to an E. coli outbreak in the U.S. and Canada. An investigation is ongoing. In the meantime, Health Canada is warning people in Ontario and Quebec to stop eating the lettuce. Scroll down for a list of symptoms of an E. coli infection.\nThe reason: an outbreak of E. coli that has produced dozens of cases of illness in the United States and Canada.\n"There have been 18 confirmed cases of E. coli illness investigated in Ontario (3) and Quebec (15)," according to the press release.\nOUTBREAK: Individuals in ON and QC are advised to avoid eating romaine lettuce and salad mixes containing romaine lettuce until more is known about the outbreak and the cause of contamination. Find out more: https://t.co/FQ4haiBQoG pic.twitter.com/VQlmSLzeCs\n— GovCanHealth (@GovCanHealth) November 20, 2018\nBecause the investigation is ongoing and no single brand has been identified as a carrier, the health agency is telling individuals to "avoid eating romaine lettuce and salad mixes containing romaine lettuce until more is known about the outbreak."\nE. coli is a bacteria found in the intestines of cattle but can spread to produce that has come into contact with their feces, the press release explains.\nSymptoms of an infection in humans include:\nnausea\nvomiting\nheadache\nmild fever\nsevere stomach cramps\nwatery or bloody diarrhea\nThe current strain is expecially pernicious and is "more likely than other strains to cause severe illness. Pregnant women, those with weakened immune systems, young children and older adults are most at risk for developing serious complications," states Health Canada.\nThe CDC in the United States has also issued a warning to American citizens:\nOutbreak Alert: Do not eat any romaine lettuce, including whole heads and hearts, chopped, organic and salad mixes with romaine until we learn more. If you don’t know if it’s romaine or can’t confirm the source, don’t eat it. https://t.co/NrFOIxG8hx pic.twitter.com/FuzkHv4bd3\n— CDC (@CDCgov) November 20, 2018\nIf you think you may have an E. coli infection, contact your doctor immediately. To learn more about E. coli and its risks, review this page. To learn more about the current romaine lettuce warning, read this.