almost 3 years ago - Jokka^_^ - Direct link
Hello Simeon, in short, yes there will be some lore that explains the virus.

You as a player will have to use your intuition and really dig to find information on that, this can be uncovered by world exploration, and it's likely to be in areas that are... less safe ;) Plan Accordingly! Hope this help, if you have any further questions, feel free to go at it, we won't share too much information though, as this is up to the players to discover.