At the end when the camera travels back into the bunker, don't we see Invisibles rising from the bodies of The Strangers? Something that is mentioned in passing in the film, which you are supposed to take as wild speculation or rumour but then with hindsight it is foreshadowing the ending. This suggests that they are linked somehow but how?
* They could be the next stage in the virus but I can't seem how that'd extract heat from the surroundings.
* It could be this is a hint that the virus is nanotech, with the old library footage of biological experiments, including the Russian dog head transplants, being misdirection. It might be The Strangers are then a stage in the evolution of the nanotech virus, the bleeding being part of the replication process, gestating until they can emerge as fully independent entities. The cold could then be then working by extracting heat.
* It might be they are aliens and the guesses about what caused all this are wrong, influenced by the propaganda broadcasts. Everything may have happened so quickly they are had very little information to work with.
The massive destruction on the Earth (after 9 years) and the massive amounts of debris in orbit might suggest this wasn't a simple nuclear war, although quite what it was is unclear.
I do think The Invisibles are significant somehow to the larger explanation but I like the way the filmmakers avoided trying to explain everything at the end, even if they themselves have worked it all out.
I'm personally going with the second option I give above, although it doesn't quite explain everything, although it might do.
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