If you had actually read the article, you would have discovered that the epidemic outbreak of the disease is precisely what scientists are trying to figure out.

If you had actually read the article, you would have discovered that the epidemic outbreak of the disease is precisely what scientists are trying to figure out. And, it's not a global outbreak - certain remote regions of the world haven't been impacted. It's pretty analytical as well - they are comparing blood serums that have been stored over time to determine when it first showed up in the population.