For plenty of these events we do not know the reservoir animal (yet). So that butcher will know they are butchering a pig, not a bat. But that pig may have become infected and if the butcher isn't very careful he may infect himself and if the meat isn't prepared carefully it may infect those that consume it. And by the time we realize it has happened these important bits of data may have already been lost.
There is a very good book on the theme called 'Spillover', highly recommended and so far it seems to have been exactly on the money with how this whole thing unfolds. Uncanny actually, it is like having the spoiler for a movie that wasn't made yet.
https://en.wikipedia.org/wiki/Natural_reservoir
For plenty of these events we do not know the reservoir animal (yet). So that butcher will know they are butchering a pig, not a bat. But that pig may have become infected and if the butcher isn't very careful he may infect himself and if the meat isn't prepared carefully it may infect those that consume it. And by the time we realize it has happened these important bits of data may have already been lost.
There is a very good book on the theme called 'Spillover', highly recommended and so far it seems to have been exactly on the money with how this whole thing unfolds. Uncanny actually, it is like having the spoiler for a movie that wasn't made yet.