So far technology had failed to reproduce the extract, a benign virus that enhanced the body's ability to renew itself without genetic error.

Vaccination, invented in 1796, let doctors infect patients with a kindred but usually benign virus (cowpox at first, vaccinia later) that gave smallpox immunity.

I "Medically valuable little creatures, benign viruses, " I said.

He considered it a benign virus.

The only solution was to design special software that could perform the task, by being injected - like a benign virus - into all the programs involved.

Last summer, for example, a benign virus, Simile.

Contrary to common belief, harmful viruses may be in the minority compared to benign viruses in the human body.

That may change, though, with some help from a tiny benign virus and a professor at the Massachusetts Institute of Technology.

Grinde B (2008) "Is chronic fatigue syndrome caused by a rare brain infection of a common, normally benign virus?"

But others believe H.I.V. resulted from a recent mutation of a formerly benign virus.