A vaccine stimulates your immune system to produce antibodies, exactly like it would if you were exposed to the disease.

The vaccine stimulates the immune system to destroy cancer cells.

Researchers hope a vaccine can stimulate two types of immune responses in particular.

Thus disease occurs before a vaccine can stimulate the immune system to defend itself against invading organisms.

Scientists say they hope the vaccine will stimulate the body's immune defenses in a way that prevents the virus from infecting and killing a person.

Although the vaccines did stimulate antibody production, the antibodies were not the "broadly reactive" kind that seem to be essential for protection.

A vaccine stimulates a primary response against the antigen without causing symptoms of the disease.

Recently a French researcher reported that a different experimental vaccine had also stimulated an immune response.

"We actually think the vaccine is stimulating the immune system to come in and take up the plaque."

Such vaccines do not prevent cancer, but stimulate the immune system to fight the cancer once it has appeared.