Salad is usually synonymous with healthy eating. Except now, as the US grapples with an expanding outbreak of cyclosporiasis that’s sickened more than 7,100 people in Michigan alone, likely caused by iceberg lettuce supplied by Taylor Farms.
In fact, leafy greens are frequently implicated in instances of foodborne illness. There was a 2022 multistate E. coli outbreak tied to romaine served on Wendy’s sandwiches and 173 cases of norovirus linked to Illinois eatery D.C. Cobb’s. In 2021, BrightFarms recalled packaged salad greens sold in several states after 31 people got salmonella. And in 2019, a total of 167 people were infected with E. coli after eating romaine harvested from the Salinas Valley region in California. This isn't even the first cyclospora outbreak linked to lettuce: In 2020, Fresh Express salad kits were linked to more than 700 cases of people afflicted with the parasite.
The Centers for Disease Control and Prevention estimates that produce is responsible for almost half of the reported foodborne illness cases, with leafy vegetables topping the list. So what is it that makes lettuce a major source of America’s foodborne tummy troubles?
One big reason is simply because lots of people eat it. Lettuce is the second-most-consumed vegetable in the US behind potatoes. (The latest outbreak ensures potatoes will remain the king of US veggies. Plus, French fries.) Wraps, subs, tacos, you name a fast food sandwich and it’s almost certainly got lettuce on it. Salad-slinging chains are fixtures across the US. Grocery store coolers are stocked with salad kits, on top of the unadorned heads of iceberg lettuce and containers of spinach.
Those ready-to-eat salads and blends of spring mix pose a particularly acute risk because they contain multiple types of leafy greens, which can come from different farms and locations. If one type of lettuce in the mix is contaminated, it can contaminate the whole bag. And because that contaminated lettuce gets packaged into lots and lots of bagged salad, it has the potential to spread germs far and wide.
