1.   An advisory committee of the Food and Drug Administration recommended approval of the first such vaccine, but with ambivalence about its safety and effectiveness.

2.   But he said it would be two or more years before human trials of such a vaccine could begin.

3.   Despite its association with bioterror, such a vaccine is expected to have a good safety profile.

4.   Hugh A. Sampson, director of a newly opened allergy clinic at Mount Sinai Medical Center in Manhattan, is working on such a vaccine.

5.   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.

6.   Repeating the Australian study with children who have received such a vaccine could prove whether rotaviruses really spark off diabetes.

7.   Researchers reported on Thursday that for the first time experimental animals fed such a vaccine produced antibodies against an infectious organism.

8.   Since most countries are failing to reduce the number of new smokers, should such a vaccine be given to every teenager before they take up the habit?

9.   So may be a vaccine to prevent AIDS, if such a vaccine were devised sometime early in the next century.

10.   Such a vaccine, though, is likely years away from the market because of huge costs associated with development and problems finding one that is effective.