Overview

• A UK Health Security Agency spokesperson said even packets labelled pre-washed should be rinsed to prevent bacteria spreading through the bag
• University of Leicester research shows that moisture and leaf nutrients create an ideal breeding ground for bacteria even when chilled
• Studies found Salmonella thrives in spinach bags while E. coli flourishes on rocket leaves
• Experts recommend eating bagged salad on the day of purchase, checking sell-by dates and avoiding bags with mushy leaves or inflated packaging
• The NHS warns contaminated salad can cause sickness, diarrhoea, abdominal pain and fever, advising rest and plenty of fluids for recovery