Consumer Reports has run extensive tests for bacteria and found 83 percent of the chicken tested harbored the kinds of bacteria that are the leading causes of food poisoning.

Leighton Kunkle has nerve damage in his hands and feet from Guillain-Barré syndrome, a side effect of food poisoning caused by the bacteria campylobacter. He believes he got sick from eating undercooked chicken in a restaurant.

Consumer Reports tested chicken purchased nationwide to see if it contained the bacteria campylobacter or salmonella — the two leading bacterial causes of food poisoning. According to government figures, they sicken close to 3.5 million Americans a year and kill more than 700.