1.   But the findings do not refute the theory, because different vaccine batches may have been used in Africa and Sweden.

2.   Different parts of the world have different strains of AIDS, and each may require a different vaccine.

3.   Like Desrosiers, Dr. Ruprecht is studying other HIV genes to determine if any could be deleted singly or in combination to develop a different attenuated vaccine.

4.   Scientists need to test as many different vaccine concepts as possible but not proceed prematurely with widescale tests, he said.

5.   Several companies are working on different vaccine approaches to HIV, although none are significantly far along in development or are working on more than one approach.

6.   Since then, the Food and Drug Administration approved a different vaccine that it says causes far fewer side effects.

7.   Two different vaccines for Lyme are currently being tested.

8.   A different pneumococcal vaccine for adults has been available for years.

9.   The National Institute of Allergy and Infectious Diseases, the biggest vaccine backer, is financing two dozen different possible vaccines.

10.   The rest got a different experimental vaccine that has no effect on pneumococcus.