We suspect that some race of humans need blood to stay young/ healthy etc.

What if the virus is one that was a white hat release that was like a mild cold for us, but fatal or very bad for those with blood drinking genetics?

Is this what True Blood was signaling? The writer wanted to call it aids/ hiv but the show thought is was too stigmatizing to use. But now that they claim to have found an inserted segment that looks like hiv, and patients are testing hiv positive… hmm

“Hepatitis D, or Hep D for short, is a non-fatal strain of the Hepatitis virus found on the HBO original series True Blood. Known to have been affecting vampires since the series' first season, Hep D is a virus that, while harmless to humans by itself, will weaken vampires if they drink from a human that has it. Bill explains that Hep D is harmless to humans but will weaken a vampire for several months which puts them in danger of being harmed or killed. There is no known cure.”