They have not yet developed a vaccine for the disease.

The finding may be a step toward developing a vaccine.

Drug companies and government researchers are working now to develop vaccines.

Four companies have developed potential vaccines and plan clinical studies.

The experiment is the first step in a long process of developing an effective vaccine.

And she had developed a vaccine- for Federation member species, at least.

No treatment is available, thus the urgency in developing a vaccine.

But little money has been committed to developing such vaccines.

"If you want to try to develop a vaccine, that's a problem."

Team members added that the prospects of developing a vaccine were good.