51.   Lederberg said the disclosures mandate an intensified effort to determine whether low doses of nerve gas can cause long-term illnesses.

52.   Locals say they know not to eat the fish at certain times of the year when algae blooms from the sewage cause illness.

53.   Most cheese is made with heat-treated milk to get rid of micro-organisms like listeria monocytogenes that can survive in raw milk and cause severe illness.

54.   Most experts suspect that the illness was caused by a lack of vitamins or other nutrients.

55.   Mr. Houssiere said he asked for the documents to understand why Dr. Gabriel had concluded that there was no evidence that the implants caused illnesses.

56.   Most people exposed to tuberculosis are able to keep the disease at bay -- the bacteria remain in a dormant state in their lungs and never cause illness.

57.   No one denies that diet affects insulin levels, or that excessive insulin can cause illness.

58.   Next in line for flu shots, to be administered in November, are those at lesser risk of complications or of causing illness in others at higher risk.

59.   Normally the flight attendants would have had to prove that their illnesses were caused by secondhand smoke.

60.   Other researchers are testing vegF coated with membranes, or inside a virus that has been crippled so it will not cause illness.