What's interesting to me on a meta level is that this appears to be a very hotly contested topic in the United States. Meanwhile it's not even making news over

What's interesting to me on a meta level is that this appears to be a very hotly contested topic in the United States. Meanwhile it's not even making news over here in Germany, outside of "Americans are discussing odd things" kind of reporting. I believe it's generally accepted that it's most likely an animal origin. That's just a data point, but it goes to show how political the debate is.