Can a pokemon only have Pokerus once?

[Voltagenic]

I got a Lugia with Pokerus, and it's not spreading.

All my other pokemon in my team have had Pokerus once before, so I'm wondering (insert thread title).

[garra_of_the_desert]

No they can't! It is like a real virus, one you get it, you can't get it again. Kinda!

[Pkmn Trainer Alex]

To elaborate, when a Pokémon loses its Pokérus, it gains immunity. The effects of it, however, meaning the accelerated EV-growth, still remain. It just means that it can't be spread to or from that Pokémon anymore.