uh, thats a bit underwhelming, but there is some interesting info that can be considered canon
That Alex was sick before injecting the virus, her body reacted to it ans she got worse, although the files mention the "viruses" that were keeping her alive.
That Alex made some modifications to Natalia to make her stronger, it sounds weird because we never see Natalia displaying superhuman strenght on the game beyond her sensing ability.
Nothing about the relationship between Alex and Albert beyond that they were "rivals"
Finally, Neil responded differently to Uroboros, because, why? its the same as Wesker, so that means Neil adapted better to the virus, its an explanation, but whats so special about him? its not like Alex was surprised to see him like that..
In Japanese, there is no plural unless specified/dictated by context. The "viruses" part is the translator taking liberties. Supplemental material only mentions her being kept alive by t-Phobos.
As for Neil, he has some compatible genes and thus can control the Uroboros pustules. However, that transformation is NOT caused by the Uroboros Virus and is nothing like Wesker's, whose transformation was caused by absorbing a large amount of the virus. The virus was designed to be stable and eliminate freak mutations, so Anpo is wrong on that part and contradicts BIO5. How can you create a new humanity if it's just a bunch of freaks that don't have any similarity and are genetically incompatible, unable to breed? On top of that it's stated that there are only two outcomes with Uroboros, superhuman or tentacle monster. That's its point... So really, Neil's mutation was caused by t-Phobos and Uroboros interacting, just like with Alex.
Interestingly, Alex can't control the Uroboros pustules, so she doesn't seem to have compatible genes... so her illness is not what caused her to not become superhuman with the t-Virus variant, she just wasn't special enough.
As for Neil, he has some compatible genes and thus can control the Uroboros pustules. However, that transformation is NOT caused by the Uroboros Virus and is nothing like Wesker's, whose transformation was caused by absorbing a large amount of the virus. The virus was designed to be stable and eliminate freak mutations, so Anpo is wrong on that part and contradicts BIO5. How can you create a new humanity if it's just a bunch of freaks that don't have any similarity and are genetically incompatible, unable to breed? On top of that it's stated that there are only two outcomes with Uroboros, superhuman or tentacle monster. That's its point... So really, Neil's mutation was caused by t-Phobos and Uroboros interacting, just like with Alex.
Interestingly, Alex can't control the Uroboros pustules, so she doesn't seem to have compatible genes... so her illness is not what caused her to not become superhuman with the t-Virus variant, she just wasn't special enough.