1) The document discusses the history of reported zombie attacks from ancient times through modern day and explores what biological factors like viruses or prions could cause a real zombie pandemic.
2) Experts note that a mutated prion like that which causes mad cow disease could theoretically cause humans to become violent if transmitted between people.
3) While fictional zombie stories are popular entertainment, the modern concept of a zombie outbreak is grounded in real scientific knowledge about how diseases and pandemics spread.