11.   In addition, the drugs must be taken three times a day without fail, to prevent the virus from becoming resistant to treatment.

12.   Protease inhibitors are a new, powerful type of drug used by doctors to prevent the virus from reproducing.

13.   The new trial is designed to determine whether the drug famciclovir can change the natural course of genital herpes and prevent the virus from reactivating.

14.   The researchers found, in laboratory experiments, that white blood cells make substances that can prevent the virus from growing.

15.   The virus was prevented from getting into the German chancellery, law enforcement agency, and defense ministry because of a computer security system.

16.   Vertex and Eli Lilly recently announced that they were developing a protease inhibitor that could prevent the virus from making infectious copies of itself.

17.   When she answered yes, she was immediately placed on AZT, the powerful anti-viral drug that prevents the virus from multiplying, but at a cost.

18.   People who had close contact with either Lahana or Mambana have been monitored closely by South African health officials to try to prevent the virus from spreading.

19.   Across Europe, barriers were going up to prevent the virus from skipping across the English Channel.

20.   All of those infected are reported to be in a satisfactory condition and sanitary officials are working to prevent the virus from further spreading, it said.