One more then?Sure. Mutations happen in nature all the time. Basic genetics. When you have a thousand viruses present in millions of bats in China a change in a capsular protein of one of those viruses occurring randomly could make it virulent to a human. It's seems like it would be awfully coincidental that this has happened in China now a couple of times. Corona virus vaccines in animals seem to remain pretty effective for many years without much antigenic drift. What does tend to happen is a new virus maybe from a new source will mutate and cause a new syndrome in an animal species which has a vaccine for an older CV.
H1N1, is thisfrom two animals, or, is this from two virii from a shift? Or, are both right?