It is a rare virus, but it could be a major threat to Vulcan as well.

A repertory of rare exotic human viruses is essential for the development of successful therapy at the genetic level.

T'Pas died unexpectedly, at a young age for a Vulcan, the victim of a rare virus.

How and when did this rare virus get here?

Ad14 is a rare emerging virus that can cause severe respiratory infection, which can sometimes be fatal, even in healthy young adults.

Some rare viruses reformat the user's hard disk, wiping out all data.

Not only did she have this rare virus, but she was missing three liters of blood.

Afflicted by a rare virus, she completely lost the sight in her left eye.

But in 1985 four young adults who had been treated this way years earlier died from a rare, fatal virus.

Thomson's only son, 38-year-old Bobby, who was married with a 3-year-old daughter, died suddenly on Father's Day of a rare virus.