The viruses, he said, appear to be very difficult to spread through the air.

This virus appears to have evolved before the 1950s when it was first reported.

During each outbreak, the virus appeared out of nowhere and then disappeared.

I understand that it was worse when this virus appeared in Africa.

It would have explained why the virus repeatedly appeared in medical settings.

In the year 2056, a virus has appeared in the main defense computer of the planet Earth.

While California reported a human infection, the virus had not appeared in the region's wildlife until now.

Despite shutting down completely for months at a time the virus appears not to have left the stable until the end of the 1969 season.

This virus, however, not only was killing chickens but quickly appeared in humans as well.

And just as they're getting the hang of cyberspace, the virus appears.