1.   Chiron has a number of new vaccine candidates in the works.

2.   A handful of vaccine candidates, including a federally supported one involving a weakened canary pox virus, are at various stages of development.

3.   But few vaccine candidates have thus far lived up to their promising early results.

4.   It will steer each vaccine candidate through development and, if warranted, testing.

5.   Just which of the myriad vaccine candidates might survive the grueling testing phase and marketing hurdles is impossible to predict.

6.   Researchers estimate it may be two years before the next vaccine candidate is ready to move into large-scale trials.

7.   These findings, in turn, led to a new AIDS vaccine candidate, and last month doctors began using Kenyan volunteers to test its safety.

8.   We have a vaccine candidate.

9.   Yet few major companies are involved in the vaccine effort and only one AIDS vaccine candidate has been deemed ready for testing on large numbers of human subjects.