What's the purpose of virus'?

Some discussions have the potential to rock your world. This
certainly is one of those. Join Dr. Wade as he discusses with Dr.
Peter Slane how virus' actually detoxify the body.
What if you found out that virus' played an important role in our
body and actually help serve a purpose for our immune response
and health status?
What if that were not new information? What IS a virus? What
purpose do they serve? Are they alive?
This interview with Dr. Peter Slane is incredibly revealing and
completely shifted my perspective. Why is it that virus's and
bacteria elicit no symptoms in many of us? What activates a
virus?