Researchers have identified a previously unknown giant virus that may offer new insight into how complex life first evolved.

A virus may be microscopic, but it contains thousands of nucleic acid bases strategically packaged into a protein shell. Knowing how the virus organizes these vast information stores in a compact ...

Live virus vaccines use a weakened virus to help your body fight the real disease. Some people, like those who are very sick or pregnant, should not get live virus vaccines. A live virus vaccine ...