"This most primitive virus, which we call the 'Ancestral Virus,' is the origin of the tens and millions of zombie virus variants that exist today. The zombie virus differs from other viruses, which may become new viruses after mutating. But even after mutating, the zombie virus still retains a connection to the Ancestral Virus that we can't quite explain... Simply put, the Ancestral Virus is the 'root,' and the current zombie viruses are the 'leaves'! If we could thoroughly understand the Ancestral Virus, we should be able to find a way to deal with the zombie virus! But..."
"But that's basically impossible. It's been 10 months since the virus outbreak, so how could there possibly be any of the Ancestral Virus left that hasn't mutated..."
