Since viruses arenít technically living organisms, where did they come from and how were they formed how have they evolved?
We put this question to Cambridge University Researcher Ed Hutchinson:
In the case of flu youíve got the fact that flu will spread from organism to organism so although weíre worried particularly about a human virus or a virus of livestock as well it actually starts of as a virus in waterfowl. Things like ducks where itís not really a pathogen at all. It just lives in there and gets along with them. That doesnít really tell you where a virus has come from. We know that they can spread from organism to organism. In the first place viruses probably evolve as just bits of the genetic sequence which just get out of hand and start copying themselves, moving to places they shouldnít and acquiring more and more abilities along the way. There are quite a few examples of this where thing start jumping around inside genomes eventually will get the ability to jump from cell to cell as well.
Chris: In the answer to what came first, chicken or the egg, the virus cell situation has to be the cell came first, the virus came later.
Ed: Remember, the defining feature of the virus is that itís absolutely dependent on taking over a cell to work. Without a cell the virus isnít going to do anything at all.