Void genomes are permanent cures, but the effects differentiate between the different types. He is immune to the exterior virus, although by drawing someone's void he also absorbs their manifested virus. This is only temporary, when he lets go of the tainted hearts they go back to being tainted to their original host, so he should be restored back to normal when he lets go of everyones void.

It wasn't a cure. It controls the virus in some way.

Was this stated anywhere? I don't remember any of that being said. I believe Shu should still keep Souta's virus even after he lets go of Souta's Void.

I think Shu said he give back their Voids but keep Souta's virus in this ep.

I don't think that makes much sense. Everyone's void has the embodiment of the virus carried inside it, therefore by giving it back, the virus should also be transmitted along the void. He said he could decide whether he keeps the virus or not, although I highly doubt that he has any control over anything except using the voids, and drawing them. The rest is done by Kurousu's formula, and he shouldn't be able to alter anything that's built in, it would only lead to a plot hole.

A lot of people have the virus inside their bodies but it never break out until Mana sang her "song". The Genomic Resonance activates the sleeping virus. So even if Souta would be infected again when he becomes his void back, it doesn't meen it would break out.

And Haruka stated, that Shu's void can isolate and absorb the cancer and the genetic material of the virus.

And Inori's song is the counter to it,apparently.

Relate the virus to radiation, the more you're exposed to it the worse its gets. In this case it forms a single specific cancer instead of a wide variety of long term effects. The cancer then spreads like any other cancer to the extent where it kills you, regardless of whether you're in a decontaminated area or not.

Now if Mana does another attempt at lost christmas, it would basically speed up the cancer's effects to kill you instantaneously. Although some people are more resistant and would at the most survive a few extra hours compared to the rest, unless you have a genome.

After the event which is what were seeing right now, almost everyone in Japan has radiation poisoning, and the virus is still very much alive. This is Souta's case as well, he became symptomatic since he was barely taking any vaccines. It had very little to do with the second Mana event, and more with the lack of vaccines.

As for his void, you can't prove that he can't give the materialized cancer back alongside their voids, more on the line that he chooses not to.

What's with the killsats through? They are most certainly getting less attention and discussion than they should be getting,because how the hell did they launch them in the first place? Are there any limitations to the Leukocycte's power? Why doesn't he just rip Shu apart from above? Void or no Void,he won't survive what seems to be a high-yield warhead.