Romaine lettuce in the US is currently under the cosh of a Food Safety Alert: don’t eat it, whether head or heart or baby; don’t sell it; and don’t eat ready-mixed Caesar salad, which contains it. Contamination with E. coli O157:H7 is the reason. An outbreak started in October, with 50 cases across 11 states, as well as in Ontario and Quebec, with 13 in the US admitted to hospital. The lettuce may have been grown in California, unlike the produce that caused the first romaine outbreak this year, which was grown in Yuma, Arizona. That outbreak lasted from March to June, and was the biggest E. coli O157:H7 outbreak in the US for many years, with 201 cases (96 hospitalised) and five deaths.