I’m sure I don’t have to tell you this is controversial subject matter. I, myself, am not a formally trained biologist or anthropologist, but I will do my best to explain.
As I have noted in past entries, Tzombi individuals have a condition known as Post Mortem Mobility Syndrome (PMMS). The syndrome is characterized by a technical “death” (cessation of normal respiratory, lymphatic, reproductive, and circulatory system function); an altered nervous, endocrine, and digestive system; a post-mortem consciousness and mental facility of varying degree.
Studies have shown that this syndrome is also characterized by the violent death of a human being – a death that involves an excess of adrenaline production, which in turn activates a dormant substance dubbed R428 – and the subsequent reanimation of that deceased human (in a period of 2 to 48 hours). The R428 then assumes control of the nervous system and establishes a baseline brain function, which in turn stimulates the skeletal, muscular and endocrine systems.
Mental faculties vary greatly; the modern classification for the levels of this brain function (established by the CSLD) are high-functioning, low-functioning, and feral.
In short, human beings transition into a tzombi state (via PMMS) by two means 1) they contract R428 by natural causes or 2) they contract it via blood to mucus contact in certain tzombi-human relations.
How people contract this R428 substance by natural causes is still a scientific puzzle. My own theories tilt towards a genetic evolution, but other theories assign blame to a virus or airborne pathogen.
(There is also a segment of certain fringe political communities that insist R428 is a government experiment gone awry, but I think my extensive historical timeline neatly puts that ill-conceived theory to bed. Even if, in fact, the government had somehow recreated an earlier genetic marker that resulted in the birth of a Tzombi population, I highly doubt it would bear any resemblance to the scenario outlined in the internet conspiracy film, UNCHAINED CONSEQUENCES)
Where the controversy arises, as you can imagine, is in the labeling of this R428 substance as a VIRUS, which in turn identifies it into a pathology. Classifying R428 as a disease is a slippery slope and is something that most certainly is used to discriminate against the Tzombi population on a variety of topics (as it has been for centuries). If we continue to treat the Tzombi population as something that could potentially be “cured,” are we not stripping away a piece of our own humanity?