1.   Edward Jenner developed a vaccine against smallpox.

2.   He had developed a vaccine using virulent forms of polio that were then killed with formaldehyde and injected.

3.   It took Decades to develop a vaccine for polio.

4.   Similar trials have already started in Britain, where the vaccine was developed, and early results show no complications.

5.   This turned out to be true, and Jenner was able to develop a vaccine.

6.   Researchers are collaborating to develop the vaccine.

7.   A new vaccine has been developed against Hepatitis A, which affects about ten million people world-wide each year.

8.   American scientists had developed a vaccine against a killer using cultures from human fetal kidney cells.

9.   An HIV vaccine can be developed, but only if resources are applied systematically by government and industry, Moore said.

10.   And it would be a triumph for humanity if scientists could develop a vaccine against HIV, as he proposes, but many doubt one will be available soon.