Even if these experimental vaccines prove safe, they will have to pass trials to test their effectiveness, and such products are still years away.

An experimental vaccine proved 100 percent effective at making young women immune to a sexually transmitted virus that causes many cases of cervical cancer.

AN oral vaccine against multiple sclerosis has proved promising enough in a small pilot trial to merit broader testing, scientists have reported.

A much-vaunted experimental vaccine for tuberculosis proves to be largely ineffective against the disease in human trials.

Also, a vaccine produced now might prove to be the wrong one if another strain of virus caused a pandemic.

But no one is sure whether an effective vaccine will prove feasible.

In one study the vaccine proved about 90 percent effective in young children, higher than the injected vaccine's effectiveness in some years.

An experimental vaccine has proved highly effective at preventing cervical cancer in a two-year study involving more than 12,000 women, researchers reported yesterday.

Even if the stolen smallpox was genetically altered, the current vaccine might prove at least partially effective.