Many are very worried about all the bio weapons scientist that left the former Soviet Union after its collapse. Many of these folks went to the highest bidder, other nations which wanted to hire by a weapon scientist for their military. Many nations in the Middle East had hired these folks, some went to China, and others are scattered around the world.
Some conspiracy theorists even believe that the recent Swine Flu Pandemic in Mexico City was the work of a bio weapons team. I am not going to get into conspiracy theories here, but this scenario fits, and that would be just the kind of thinking a bio weapons scientist to consider unleashing a deadly bio weapon into a densely populated urban city. And, since it is happened half a world away from the Middle East, and China the whole thing sounds plausibly deniable.
Of course, I am not a spy fiction novel thriller writer or author, but there are some that believe that's exactly what happened. But it even gets worse because in the Philippines Swine Ebola was discovered, which is very serious considering it is attacks the respiratory system and could combine or be scientifically forced to combined with Swine Flu, and therefore, spread so fast, that it would not burn itself out like Ebola outbreaks often do.
All the components are there, but why do bio-weapons scientists dare to create this mutation? Intelligence sources tell us that many Chinese medical virus research scientists have been trained in Russia, and have gone back to work with the Chinese bio weapons program. This is a totally scary thought, and it keeps people up at night in the intelligence sector, and scares the ever living crap out of anyone in the know. Please consider this.