While the discovery of a new virus in this hemisphere is considered scientifically significant, Mayor Giuliani said it had no practical impact on the city's response to the outbreak.

In late December, when Network Associates announced the discovery of a virus called Remote Explorer, the company's stock jumped 22 percent within a week.

It came back to mind, generating a fresh flush of guilt, when I heard about the discovery of a devastating fruit-tree virus in Pennsylvania.

Early in the 20th century, the discovery of a virus that causes leukemia in chickens had inspired numerous unsuccessful attempts to find viral links to human cancers.

But news of the discovery of a virus in chickens has already affected shoppers.

This was the first discovery of a rabies-related virus.

Their discovery of a virus that causes the cancer Kaposi's sarcoma in people with AIDS, is being hailed as an important advance.

Dr. Lo created a furor in 1986 when he reported the discovery of a new virus in AIDS patients.

The discovery of a lethal virus.

The discovery of a lethal virus, more infectious than H.I.V., and the efforts to keep it from spreading.