Lettuce recall expands as FDA investigates Arizona farm as source of E. coli outbreak

Lettuce recall expands as FDA investigates E. coli

Students sickened in E. coli outbreak; FDA investigating Ariz. lettuce farm

E. coli outbreak may be from Arizona lettuce farm

3 critically ill in E. coli outbreak of strain; FDA investigating Ariz. lettuce farm

FDA investigating E. coli at Ariz. lettuce farm