Oh, I've been shown bits and pieces of evidence for awhile now, but nothing I'd consider a smoking gun. But I always come back to the same question - what does the source of the virus matter? Humans have lived with viruses for as long as they've been humans, and our ancestors have as well, I'm assuming back to the protozoan era. I suppose we used to blame god for them, but perhaps now we can blame someone else, and I'm sure in the future the technology will exist such that they can be manufactured by students at home. Regardless, it still seems that the best defenses against them have not changed drastically in recent history.