Calculated how? You said it had to be precise according to body weight. Wesker bathing in it and the randomised effect of a populated area being hit with a cruise missile don't seem much different to me.

So the entire thing is completely moot.

UROBOROS PROJECT EXECUTION DOCUMENT

The effects the Uroboros Virus causes on human DNA.
It will become a fatal strike to those that are unworthy, and have only inferior genes. Many people will not be able to bear the selection and will be reduced to the infinite serpent which crawls on the ground and consumes itself.
Only those valuable few people with truly excellent genes will become worthy.

Those disqualified have no use in the coming world.
Tomorrow, only those chosen can enjoy the grace of the rising sun.
Tonight, the Uroboros Virus will be released upon the world.
As planned for some time, the Uroboros missiles carried in the bomber will be launched simultaneously with arrival in the tropopause.

The virus dispersed from the missiles will be carried on the westerlies which flow through the upper troposphere, and the selection will take root all over the world.
A virus possesses no emotions. It will screen every human being.
And those not chosen will simply look for the next host, as a host of Uroboros.

No-one can stop the cycle.
6 billion screams will repaint all of history.

Wesker had already obtained samples of various organisms and viruses including the T-Virus, the G-virus, the T-Veronica virus, and Las Plagas. All of these were eagerly and enthusiastically received by Umbrella’s former rival companies who compensated him greatly for each. With wealth, power, and glory, Wesker appeared to have everything a person could ever want.

Until now, Wesker had obtained many viruses and organisms, including the t-Virus, G-Virus, t-Veronica and the Plaga. Armed with these, he rose within the rival company of Umbrella and obtained status, wealth and honor. Materially, he was contented.

My god.

Wait.... Isn't this saying he was still with the rival company of Umbrella and not is own Organization by 2006?

The most interesting part is that they put ''The'' rival organization instead of "a" rival organization. It's definitely the one from RE2. It has to be.