Zombie/infected books that have an interesting origin of the virus/plague

I have a mood to read some apocalyptic books with infected people being the threat. However, I'm kind of sick of the stories that turn more into the survivors own survival with emotions and relationships. I'm searching for something more direct, preferably from the point of view of military trying to stop, or find the origins of the virus with interesting and original takes on it.

To give you an example what I absolutely loved, it was The Last Plague by Rich Hawkins, especially the third book which covers the POV of a soldier. I absolutely love books/games/stories with a plot twist to the origin and behaviour of the thing that changes people. Best example I can give you is the Necromorphs from the game called Dead Space, which blew my mind at the end.

Is there anything like this? Would you please recommend me something that you came across?