You're still missing the point of my raising that the CDC in recent history claimed that transmissibility isn't possible from birds to humans. They didn't claim we don't know if its possible, they claimed that it isn't which implies that scientific research has found that transmission didn't work.
Raising that here is important because in an earlier comment you said only a quack would claim that transmissibility hasn't been proven.
You even seem to acknowledge here that it hasn't been tested or proven yet, or that we even bother testing it today. Field research is all well and good, and it often is the best we can do in the moment, but that doesn't change what the research and data shows.
We don't do controlled studies to test transmissibility, meaning we don't test for transmissibility, meaning it has yet to be proven. I'm not sure how that chain of reasoning leaps to the realm of quackery.
> "we didn't think it was this way before, but now we think it? Impossible!"
There's a solid argument behind this view though (to be clear, I don't see that as an argument Trump has made).
Science is a well defined process. When we haven't studied transmissibility for whatever reason we simply can't say that transmission isn't possible.
As soon as the CDC gets out over their skis and makes that claim without scientific research to back it up they turned a scientific question into a political one. They can't say whether transmission is possible or not. By making this claim they're only trying to reassure the public of something they want people to believe but can't actually prove.
