Oooooh, you sneaky dog, you. I'm a junkie for realism, not an ass, just a heads-up. :P 

That being said: If it's not a virus, it'd be a bacteria. If it's a bacteria, it's an antibacterial formula... Not a vaccine. Bacterial illnesses CAN be cured. Which makes sense, since you said it was "cured". Mwahaha. I think I figured it out. >_> 

I'll probably be willing to play a doctor-turned-warrior, if you'll have me.

Medical Doctor with a focus in Diagnostic Research and a dual specialization in Infectious Disease and Neurology. Sub-specialization in Virology (sub-category of infectious diseases). Former professor and head of diagnostics at hospital turned "field doc" for a Peacer gang. His fancy specializations have little to no real help when treating field wounds, but it earns him the flashy bragging stuff: "Haha, I'm smarter than you" kinda stuff.