No, it doesn't get the effect at all.
I had the spreading problem, but somebody told me a great way. Have four Pokemon in your party, and place the two Pokemon you want to have Pokerus in the second and fourth slots, and the Pokerus sufferer in the 3rd slot. With the first Pokemon, fight a couple of battles, either by using VS seeker or Pokeradar, then check to see if the Rus has spread. It's been very helpful to me.
Your first answer is wrong. Cured Pokerus still doubles EVs, it's just not spreadable anymore.