S. Dealler, THE KEY MUST FIT - MACROPHAGES TRANSPORT PRION INFECTION TO THE CENTRAL-NERVOUS-SYSTEM AND MAY DETERMINE THE SITES OF INFECTION WITHIN IT, Medical hypotheses, 49(3), 1997, pp. 213-220
It is suggested that the agent for transmissible spongiform encephalop
athies is trasferred from an original peripheral site of infection int
o the brain by recruited and selected circulating macrophages/monocyte
s. It is because of this selection that strains of disease appear to b
e different when infecting separate species, but retain characteristic
s when infecting a single species.