The 2009 swine flu epidemic originated in the states. Are you asking to shut down pig farms in the US as well?
As another comment [1] mentioned, the 2009 swine flu originated in Mexico [2].
The 1918 Spanish flu, on the other hand, originated in Kansas [3].
[1] https://news.ycombinator.com/item?id=22694893
[2] https://en.wikipedia.org/wiki/2009_flu_pandemic#Mexico
[3] https://www.kshs.org/kansapedia/flu-epidemic-of-1918/17805
If you don't, then yes, animal farms in general need to be shut down. But they won't, because the world is addicted to eating meat, and pandemics will keep happening.
Speaking of which, I need to get back to work but I'll see ya in an identical comment section in four years where people will blame, oh I don't know, the eating of chinchillas or something.