Here's the drop for what happened to my OCs.
-Kit: After finding out she was infected, she intentionally put herself in a bunker and had James disable the internal handle, locking it behind him as he left, to avoid her spreading the infection. Kit's current state is unknown.
-Skai: infected by the virus by unknown means, but lashed out and attacked her fellow Thunderbolts soldiers, mauling or infecting a number of them, getting to Stage 4 before Jason impaled her with her own Katana and lit her up with a flamethrower.
-Andrew: Infected after being bitten. Currently at Stage 2.
-James: Uninfected. In a state of grief after losing Kit, and has since formed an alliance with Jason and Smudge. James utilizes the Iron Man armor when going outside to avoid being infected by breathing it in.
-Smudge: turns out living in the age of the Spanish Flu makes you have an immunity to an infection like this. He has kept using rail travel to get from place to place and get supplies. His original engine, a PRR M1 class, developed an overheated axlebox, and Smudge ditched it for Union Pacific FEF-3 #844, not able to make the repairs needed.
-Jason: almost got infected when Skai bit his hand, but amputated it on the spot in order to stop the spread (he has since gotten a bionic replacement). Jason has a kill-on-sight policy to all infected, and has a small arsenal of weapons, such as the War Machine armor. Surprisingly, Jason was the one who suggested an alliance between him, James and Smudge, viewing their skills as necessary for survival.