11.   No one dropped out of the study because of side effects, said Dr. Lawrence Corey, the lead researcher in several vaccine clinical trials.

12.   On Tuesday, he met with reporters to urge others to volunteer for the vaccine trial.

13.   Results of vaccine trials generally come faster and require fewer participants when they are conducted in a country with a higher incidence of new infections.

14.   Rules of the vaccine trial prohibit people who are taking part in other trials.

15.   Some argue that sponsors of vaccine trials are ethically obliged to treat an infected participant with a combination drug therapy for life.

16.   Still, before WHO approves a protocol for the vaccine trials, many questions need to be answered.

17.   Studies have shown that volunteers do not generally increase their risk of contracting AIDS when they take part in HIV vaccine trials.

18.   The vaccine trials would be conducted in Thailand.

19.   Then he heard about the vaccine trial, and felt it was worth a shot.

20.   To help guard against exploitation, the panel called for requiring informed consent from each individual before that person is enrolled in a vaccine trial.