Today's Theory: Is the New Plague returning?
A theory that pops up in the Fallout community every once in awhile is that the New Plague virus is being renewed in the Wasteland. For those who do not know, the New Plague was a disease that broke out before the Great War, and various attempts were made to cure it (FEV being one). In Fallout 4 we hear from MacCready of a dangerous pre-war disease, which his son Duncan has contracted. Some believe that Duncan may have caught the New Plague. Others take it further, believing that New Plague is beginning to re-spread across America.
Evidence For:
•We know that the New Plague had infected a large amount of the U.S. population before the Great War. Though of dubious canonicity, Avellone puts the number in tens of thousands.
•Duncan's disease is both terminal and pre-war, traits of the New Plague.
•Similar to the symptoms that Duncan shows, blue boils and a fever, the New Plague is often associated with the color blue, a nickname for it being the "Blue Flu".
•Possibly a coincidence, but Med-Tek was researching an experimental cure for Duncan's disease at the same time other groups were trying to cure the New Plague.
•Prior Fallout devs planned to have New Plague make a comeback in the Fallout universe, but the plan fell through.
Evidence Against:
•Theory works on the assumption that the virus did not die despite America's decreased population, and that secured samples eventually leaked.
•It is never outright stated that Duncan's disease is the New Plague.
•Though fevers are an implied symptom of New Plague, the presence of boils was never observed by the Federal Fitness Registry.
So what do you think of this theory? Could New Plague have survived or escaped back into the Wasteland, and is now spreading?