There were two or three credible “rumors”, one of which was freepmailed to me, about accident release. I am not firm in my opinion because I do not know the facts, just lean towards the accidental side. Also seems China would not want the disruptoin the WuFlu has caused there; obviously they are exaggerating it - staged videos etc, welding doors shut, etc. But the Hong Kong protests are no more. So... TBD!
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I was buying into the accidental release too ... especially the story about maintenance or janitorial people at the Wuhan BSL-4 lab possibly stealing the infected animals to sell at the market.
Now I see ANOTHER POSSIBILITY: That these were cover stories released by a very sophisticated intelligence agency participating in a sneak biowarfare attack.