Much is known about flu viruses, but little is understood about how they reproduce inside human host cells, spreading infection. Now, a research team has identified a mechanism by which influenza ...

A hostile takeover by the virus Viruses cannot survive on their own. While they contain their own genetic material, they don't carry all the genes or factors they need to live and reproduce.

In particular, the virus does not seem to have acquired what Webby considers the most crucial modification, one that would help it more efficiently enter human-airway cells in the first place.

On the other hand, viruses aren't considered to be living organisms, because they need a host cell to reproduce. Similar to bacteria, viruses spread when they come in contact with the host.

Most organisms fit comfortably into standard definitions of “life,” i.e., cells that grow, reproduce independently, and generate energy. Viruses have always been an exception, sitting in a ...

Viruses consist only of a DNA or RNA genome wrapped in a protein coat, and they must infiltrate into cells in order to reproduce. Having invaded a suitable cell, a virus essentially reprograms it ...

All other living things are made of cells: squashy bags filled with the other essential molecules of life. Cells are intricate machines that can feed and reproduce independently.