1.   Another study among HIV-positive, active-duty U.S. military concluded that about one in five recently infected people had resistant virus.

2.   But the transmission of resistant viruses, as opposed to the development of resistance within a patient during treatment, poses a new set of problems.

3.   Efforts to find effective drug combinations for people with a highly resistant virus are called salvage therapy.

4.   Mellors cited two studies looking at the frequency of resistant virus among individuals who were infected within the past two years.

5.   Other cases result when an individual infected with a resistant virus transmits it to another person.

6.   Patients who think they are cured can pass their resistant virus to others.

7.   Resistant viruses may be losers in a Darwininian struggle within the body and may be more likely to be overcome by the immune system.

8.   The aim would be to help monitor the prevalence of resistant virus and changes in its geographic distribution for public health purposes and guide therapy for infected people.

9.   The company also presented lab data on its second generation version of the drug, which showed only minor increases in drug dosage can overcome strains of resistant virus.

10.   The hope is that doctors will have greater flexibility in treating individuals with a resistant virus by juggling the new drugs coming along with existing ones.