40 years ago?!?! Goddam it...

I have an idea that in the future we will realize that most of the diseases/cancers that plague us today, are caused by bacteria and viruses. We just don't have a full understanding of this relationship at the present time. I'm not a doctor and i hope I'm not totally wrong here or, worse yet if this is already a well known fact and I think I just came up with a novel idea because I'm special... Omg...