We all know that there's germs everywhere, plotting our ultimate end with their tiny, germ brains. (If they even have brains. If so, we're fucked.) Some people turn into a paranoid, twitching mass hysteria. (Also known as the government.)
Doesn't sound too bad, does it? Your hands or feet turning into a black, stinking, rotting mass of flesh, with bits falling off at will. Sort of a half hearted attempt at turning yourself into a zombie, without the obsession with brains.