Many scientists think the world is overdue for one and find it worrisome that this dangerous virus has popped up now.

He held the book out between finger and thumb as if it contained some dangerous virus which at any moment could threaten the whole school.

America temporarily suspended funding of research projects on dangerous viruses.

How do you ship several thousand strains of dangerous viruses 1,700 miles from one sterile lab to another?

And we believe that regimes hostile to the United States may possess this dangerous virus.

The bone marrow could contain dangerous viruses that humans had never been exposed to.

Fouchier described the result as "probably one of the most dangerous viruses you can make".

Tom Cruise is back, trying to destroy a dangerous manufactured German virus.

Many people felt insecure and afraid because nobody knew how dangerous the virus really was.

This was then divided into three levels, or zones, the deepest one reserved for the laboratories that would house the most dangerous viruses.