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i was reading something about how it's a combination of virii (i believe this was on msnbc). basically, at the moment it's hypothesized that the lethal cases were the ones with *both* of these infectants. presumably, one made you sick and attacked your immune system. then, if you caught the other one, it would be able to attack while your immune system is damaged.
hypothetically, you can get away okay if you just contract one of the virii. apparently they are relatively similar in their attack, so it very well could indicate a man-made virus.
they have been making some headway apparently too, but they have by no means solved this.
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