1.   Traditionally vaccines use living or killed forms of an organism to stimulate the production of antibodies which protect the person from infection.

2.   British and American vaccines use slightly different strains of bacteria and are mixed with different fluids.

3.   Even when given to healthy people, smallpox vaccines infrequently produce dangerous reactions because the vaccine uses a live vaccinia virus, which is similar to smallpox.

4.   In contrast to the old vaccines, which used a killed whole cell of pertussis bacteria, the new so-called acellular vaccines use only pieces of the cell.

5.   In fact, he said, such vaccines could use some tinkering as well.

6.   Newer vaccines use only pieces of the pertussis bacterium cell, and may be almost as effective with less risk of side effects.

7.   The AIDSVAX vaccine does not use HIV itself.

8.   The company maintains that the vaccine is no more dangerous than childhood vaccines used against diphtheria and whooping cough.

9.   The experimental vaccine uses harmless laboratory relatives of flu bugs designed to trigger an immune response only when delivered in the nose.

10.   The Immuno, Chiron and Genenvax vaccines all use a genetically-designed copy of the envelope surrounding the entire virus.