41.   Even those who insist that the vectors are safe acknowledge that political problems will confine HIV vectors to use in the most serious diseases.

42.   Even so, industry analysts believe this merely treats the symptoms of a more serious disease.

43.   For one thing, parents of children with serious diseases often see drug trials as their best option and are less likely to complain later if something goes wrong.

44.   For them this insect carries serious disease and sometimes death.

45.   Fortunately, only a small percentage of childhood headaches are due to some serious disease such as a tumor or head injury.

46.   He could be re-evaluated if he develops a more serious disease.

47.   He had overcome a very serious disease with strength and dignity.

48.   He said hundreds of thousands of people may have contracted the virus years ago through blood transfusions and are unaware they have contracted the serious liver disease.

49.   Higher-paying awards like those for serious diseases required proof of well-defined symptoms.

50.   In other cases, people have unwittingly self-treated serious diseases with useless herbal products and thus delayed a correct diagnosis and effective medical care.