Taco Bell removes lettuce from menu in US after links to explosive diarrhoea parasite  BBCTaco Bell lettuce at centre of growing US diarrhoea outbreak  Sky NewsTaco Bell Warned Investors About Cyclosporiasis Before The Outbreak—And These Other Chains Did Too  ForbesCDC and FDA link lettuce at Taco Bell in five states to cyclospora outbreak  The GuardianThe source of a diarrhea-causing outbreak in the U.S. has been found. Now what?  CBC