The vaccine, which will be tested in people this summer, is the first combination vaccine made in a single virus, he said.

He is now persuaded, but has found no single virus that jumped out from his studies as being particularly significant.

It would be safer to find a single virus that did the job.

I don't see a single toxin, a single virus.

Scientists have recently demonstrated infinitesimal nanotube thermometers and nanobalances capable of weighing a single virus.

That message is written on the bottom of every single virus.

A single lethal virus affecting either breed could be disastrous.

A division of the circular single stranded viruses into four types has been proposed.

Genetic analysis of this blood sample suggested that HIV-1 may have stemmed from a single virus in the late 1940s or early 1950s.

Yes, a single virus could theoretically affect all these unrelated systems.