Dr. Pepper

"Life is the Choice between Birth and Death."
What choice shall you make?

After a biological terrorist attack kills off the population of a large city one May day; everyone believes that a terrorist organization plans to unleash an Infector virus all over the world to get rid of everyone with a deadly infection.
However Salvation doctors begin to gather from all over the world to combat the virus using their Vaccinator tools to save the world and cure the world from the plague. But apparently the mastermind who is behind the terrorists and the Infectors is the Plague Doctor. Do the Salvation Doctors have what it takes to defeat the Plague Doctor?

 Dr. Pepper was praised to be one of the few genius practioners of her trade as her skill, detail, and finesse were remarkable; and she was second to none in looks and flirtatious charm; however she disappeared from the doctor's society without a trace and returned as a Plague doctor. Why has such a genius joined hands with the terrorists?