11.  Tracking down the source of tainted food has also been difficult.

12.  Police say unlicensed guides and shady restaurant owners are teaming up with unscrupulous doctors to sicken foreign tourists with tainted food and then divide up their medical insurance money.

13.  People can be infected through tainted food, water or animals.

14.  But that wariness, reinforced by recent food-safety scares over tainted Belgian food and funny-tasting Coca-Cola, has made little impression in Spain.

15.  Company attorney Anton Valukas said a government investigation found that Sara Lee did not knowingly ship the tainted food.

16.  Illness can be caused by exposure to an infected person, or by ingesting tainted food or liquids.

17.  One-third of diseases globally are caused by eating tainted food, drinking unclean water and breathing polluted air.

18.  Police say unlicensed guides and shady restaurant owners are teaming up with unscrupulous doctors to sicken foreign tourists with tainted food, then divvy up their medical insurance money.

19.  Tainted food was traced last month to Belgian animal feed contaminated with dioxin, a banned carcinogen.

20.  Tainted food was traced last month to Belgian animal feed contaminated with dioxin, a carcinogen.