1.   Although many drug companies have developed possible AIDS vaccines, neither they nor federal agencies have earmarked a significant part of their research money for the vaccine effort.

2.   Earlier-stage efforts include a possible vaccine against HIV, chronic hepatitis and a virus linked to certain birth defects and to blindness in people with AIDS.

3.   Human tests on a possible vaccine to prevent HIV are under way in Austin, the first site in Texas to take part in the trials.

4.   Now the company is working on a possible vaccine, which also may have therapeutic value.

5.   Or should the test go on, with some people receiving a useless placebo, so that researchers can learn the full potential of any possible vaccine?

6.   She insisted that the president was committed to fighting the disease by encouraging safe sex and by sponsoring research on drug therapies and a possible vaccine.

7.   Similarly, possible new vaccines against one organism that causes meningitis and against the organism that causes tuberculosis have also been created with genome work.

8.   At least a dozen companies are experimenting with possible HIV vaccines.

9.   Even as doctors worry about complacency, reports abound about possible vaccine side effects -- from scary media stories to Internet sites.

10.   Morgan described tests on mice treated with a possible vaccine produced by Elan Pharmaceuticals, an experiment which proved his own hypothesis wrong.