He didn't mention red hair, but Judas is often portrayed with it and I've read elsewhere that red hair has been associated with vampirism. Maybe there's a link. I'd never heard the Judas/vampire thing before, but it would be interesting to see if it's a genuine tradition, and if it is, how far it goes back.
I've just had a quick ping round the Internet and came across this;
Summers' 1928 book The Vampire: His Kith and Kin mentions that in particular red-headed vampires are considered the most dangerous, and trace their red hair back to Judas (or even Cain). He gives some 13th-century Latin references for this myth. Notably he states that in Bulgaria, Serbia, and Romania, Vampires are called "Children of Judas".