|Rabies patient, 1959. CDC
And it certainly scores a full 10 points on my “symptoms involve the brain” scale. Terror, paranoia, and hallucinations are likely to plague you on the way to your inevitable death.
The one saving grace with this disease is its R nought, about 1.2. That is, if you have it, you’ll likely only infect one person, who will perhaps weeks later only infect one, and so on. Therefore, it’s unlikely to burst into pandemic status the way measles or MERS or the flu could. On the other hand, the infection of a group of animals could spread it locally to humans more rapidly. If every squirrel in Ontario, for instance, had it, and if they could pass it to pet cats allowed to run loose, there would be many more human cases as a result.
A diabolical person could manipulate it in the lab to become more pathogenic and then capture, infect, and release those squirrels. Because of the 100% fatality rate (exactly one person has recovered with treatment--though she still has serious and apparently permanent problems with balance--so it’s shy of that by the tiniest fraction of a percent), it’s on most biodefense programs’ list of potential weaponized diseases.
|Rabies. Wikimedia Commons
And so we’re down to the final disease next week, my choice of the #1 scariest infectious disease out there.