People with one to seven outbreaks a year shed infectious virus 19% of the time.

Today, the highways and skyways can spread an infectious virus around the world in days.

If you haven't, you're still at risk for this highly infectious virus.

But the highly contagious and infectious virus that causes it does.

Federal law now prohibits manufacturing vaccines using live infectious exotic viruses.

Two major films that are to start production in the next few weeks deal with the same subject: the spread of infectious and deadly viruses.

Their presence in a specimen would not necessarily mean that live, infectious viruses were still present.

There is no evidence for the presence of infectious viruses or toxic products.

This sludge may contain a strain of infectious virus that we've never seen before.

An infectious virus has spread worldwide, killing almost everyone.