Is there a reason we believed that other prion diseases won't transmit? BSE -> CJD is already established, right? Seems like our base-case belief should be that these transmit, but I don't know the field.
> To date, there have been no reported cases of CWD infection in people. However, some animal studies suggest CWD poses a risk to certain types of non-human primates, like monkeys, that eat meat from CWD-infected animals or come in contact with brain or body fluids from infected deer or elk. These studies raise concerns that there may also be a risk to people. Since 1997, the World Health Organization has recommended that it is important to keep the agents of all known prion diseases from entering the human food chain.
But also consider that millions of deer are hunted and consumed in the US every year, and that hunters don't seem to be developing prion diseases at an elevated rate. We know relatively little about prions, but it seems likely that humans are fairly resilient to this, perhaps except for some predisposed individuals. Genetic factors are suspected, but there's no smoking gun. Acquired vCJD is exceedingly rare too.