11.   Chen said the case leaves many questions unanswered, such as how the baby fought the virus even in its weakened form.

12.   Combinations of drugs have proved the most successful in fighting the virus.

13.   Could baboon cells teach human cells how to fight the virus?

14.   Gallo urged that scientists in academic settings begin working on biological means of fighting the virus, building on new findings about how it enters the cell.

15.   He has his own method of fighting the virus, using vitamins and other natural products.

16.   Helps block cancer, reduces heart disease, rejuvenates immunity, fights viruses, relieves anxiety.

17.   He said Christy was still fighting a virus and would get better.

18.   His T-cells, an immune system cell that fights invading viruses, continued to fall.

19.   In a few days, the clear mucous changes to a white or yellow color as the body fights this virus.

20.   Now, with advances in drugs to fight powerful viruses like HIV, researchers hope to find a cure for the flu.