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.

Even better would be an oral vaccine, also being developed.

Four companies have developed potential vaccines and plan clinical studies.

But little money has been committed to developing such vaccines.

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.

"This base houses the most important vaccine ever developed in the history of America," it said.