Hypothetically there was a country that wanted to create a doomsday weapon that would function even beyond the deterrent capabilities of nuclear weapons. Basically a "fuck you, world" kind of weapon.If certain dissidents are to be believed, this weapon has been produced, likely still exists, and may have even been used at some point.The key feature of the virus is the incubation period. The claim is they extended the incubation period of a certain highly lethal virus to not days, or weeks, but possibly a decade or more.During this extended incubation, the number of virus particles is low enough that it shows zero symptoms, and it would be undetectable unless you were actually looking for it. While transmission rates would be quite low, over the course of a couple years it should be able to easily spread throughout an entire population. A literal 100% rate of infection.Now this has been known about in the virology community for a while. One of those intriguing campfire stories we would tell each other after one too many drinks at the hotel lobby.Well one group had the idea of testing this. Is there a latent and highly lethal virus lying dormant in the population?They took blood samples from people across the US as well as some Western European countries and discovered something quite disturbing. A mysterious virus, referred to internally as "pathogen X" present in something like 95% of the samples.It's an unusually large virus with a very particular shape, like a large toroid with spiky protruberances along the central axis.The genome is HUGE, and that makes knowing its actual payload at this stage almost impossible. It shares significant similarities with smallpox, lassa, influenza, and HIV, but it neither looks nor behaves like any of these.So the conclusion at this point is an uncomfortable one. You are likely infected by a mysterious virus that might be nothing, or it may become active at some point and almost certainly kill you.