Title: Patient Zero, Purge

Genre: Adventure/Action/Suspense/Disaster

Plot: MC is an independent/stubborn flight attendant

Travels often and gets to experience new wonders

One day, catches a small cold; runny nose and sore throat, nothing major

Shrugs it off and cold passes; Continues working and traveling

Few weeks pass by with few events

Catches another cold; Lasts a little bit longer

Two years pass, MC continuously catches a cold with it lasting longer and longer

Finally visits the doctor after persuasion from friends

Diagnoses as a virus, the common cold mutated into something deadly

Could kill her in a few weeks

No cure since there is no cure for common cold or its mutations

Around the globe, people coming down with colds that keep occuring

Due to MC's travels, virus travels almost everywhere

Scientists and doctors scramble to find cure to fatal disease

If not, millions will die from pandemic

MC realizes that he/she was carrier for 2 years and nothing major happened

MC is studied and scientists discover MC has very rare genes, allowing for new mutation

MC could be the key to the cure

Possible Twists:

MC could fall in love with a scientist/doctor and elope, leaving world to die

MC would have to die in order to produce cure

I was very surprised that there weren't any Contagion or Outbreak stories here. So here you go, with a few twists if you want. The adventure part can be when the MC is trying to find the cure, only for the MC to be the cure.

Yeah, and you can mix in some romance if you really want.