It's not only possible - it was man-made. And in regards to whether or not it was an attack - you have to ask yourself, why did China not reveal all of the facts we are now finding out about how it was initially handled there, the silencing of the whistleblower doctors, the first case was reported in November? To give the virus enough time to spread, where by then it was too late to contain it. And then to blame the US Military? Come on. You can go as far to say it was designed to target a specific generation of people, leave lasting damage to the bodies of everyone else, leaving the body susceptible to a future bioweapon. And then ask yourself the question, how does HIV inserts get into the viruses make up? Human intervention. Thus, a bio weapon was created.