11.   Not all older patients were infected late in life.

12.   Once, Rhodes said, she had overheard nurses saying hantavirus looked much like the flu and that infected patients often died.

13.   The researchers reasoned that the mental anguish provoked by the remote possibility that a patient might be infected by the donor was not worth disclosure.

14.   Their discovery may solve the mystery of why scientists never have been able to produce conclusive laboratory evidence that any Missouri patients actually were infected with Lyme disease.

15.   Their discovery may solve the mystery of why scientists never have been able to produce conclusive laboratory evidence that any patients actually were infected with the disease.

16.   They could modify the cold gene so it could not actually infect the patient with a cold.

17.   Two immediate questions, Ferguson said, are how the bacterium could have gotten into a hospital, and why knee surgery patients in particular might have been infected.

18.   When a patient is first infected, the amount of virus in the body skyrockets until the immune system is able to get it under control.

19.   When a patient is first infected, the virus multiplies rapidly in the body until the immune system is able to get it under control.

20.   When patients are first infected, Ho explains, they receive a relatively uniform HIV population.