Viruses that cause persistent productive infections (e.g., cytomegalovirus, HIV) are a particular problem because the infected person is a continual source of virus that can be spread to immunologically naïve people.

It's lanyard. It's a camp tradition. You'll have about a million lanyard key chains by the time the summer is over.

Big data has the potential to revolutionise the global healthcare system, but barriers to its adoption mean progress is slow.

The Barble fishes, if one of them chance to be engaged, will set the line against their backes, and with a fin they have, toothed like a sharp saw, presently saw and fret the same asunder.