21.   Francis is the president of a newly created Genentech spin-off, called Genenvax, that hopes to develop an effective vaccine against HIV.

22.   He noted that if smallpox is properly diagnosed, there is time to carry out an effective vaccine campaign.

23.   How many people would take such a risk from a partly effective vaccine?

24.   If either explanation is correct, an effective HIV vaccine may need to be given frequently, Fauci said.

25.   If such a vaccine could be made safe, it would offer the best hope for an effective vaccine to prevent infection with the human immunodeficiency virus.

26.   In his new role, Francis hopes to speed development of what would be the first effective vaccine against HIV, the elusive virus that causes AIDS.

27.   Nevertheless, researchers believe a new deadly strain could appear at any time, leaving people without an effective vaccine.

28.   No magic cure or effective vaccine was around the corner.

29.   Researchers hope to see a more effective second-generation vaccine licensed soon.

30.   Sandakhchiev has proposed that international research teams work together at Vector to devise new antiviral drugs and more effective vaccines against smallpox and other viruses.