A bit off topic but they just released the toxicology on the face-chewing guy in Florida: nothing but pot.
So I think we're back to our original assumption: zombie patient zero.
Per link, they are now blaming it directly on marijuana and the release of dopamine.
["It could have been the strain of marijuana that increases the dopamine in the brain, such as sativa,” said Dr. Patricia Junquera, assistant professor at the Department of Psychiatry at the University of Miami Miller School of Medicine...... There are two strains of marijuana called sativa and indica. The sativa increases dopamine and gives you energy while decreasing pain threshold. Indica is a “sleepy high,” she explained. “People don’t really know what the amount of either is in each little packet of marijuana,” she explained. “And we can’t differentiate between the two in the blood
, much less in a dead person.” She also suggested that if Eugene had a mental disorder, “the marijuana could have increased even further the dopamine levels and aggravated the situation. So that can’t be ruled out.”]
Italics highlights the contradiction in what she's claiming. The following was in one of the comments for the article and is a recent and well respected study published in a well respected journal.
Unlike other addictions, cannabis dependence of mild to moderate severity is not associated with striatal DA alterations.
Biol Psychiatry. 2012 Apr 15;71(8):677-83. Epub 2012 Jan 29.
Dopamine release in chronic cannabis users: a [11c]raclopride positron emission tomography study.
Urban NB, Slifstein M, Thompson JL, Xu X, Girgis RR, Raheja S, Haney M, Abi-Dargham A.
New York State PsychiatricInstitute, Department of Psychiatry, 1051 Riverside Drive, New York, NY 10032, USA. email@example.com