I have found a few errors in the Pokerus page.
The chance of getting pokerus is 1/21,845.3 (3/65536), and not 1/21,178.6.
Also, the page says that in order to get pokerus, you have to battle / catch a wild Pokemon. This is an error I have found in most of the sites that talks about Pokerus, and it's not true.
You can also get Pokerus from a wild Pokemon battle if you run away, and you can get Pokerus from a trainer too! (Even if you black out).
Also, Pokerus is not a thing the wild Pokemon has, it's just a random event determined at the end of the battle. In fact, it can happen that you catch a Pokemon, then a Pokemon in your party gets infected by Pokerus, but the Pokemon you just caught isn't infected.
I talked a bit more about this on the "Past Pokémon Generations Discussion" section, in a thread called "Information about Pokerus (Some corrections about it)" (sorry I can't link it because I'm new to the site and I can add links to this post apparently.)
If I need to explain anything else, please tell me and I'll be happy to do it. Also I tested this on generation 3 and 4, and I know it's the same in gen 5 (others tested it). I can't tell if Pokerus works in the same way for gen 2 though.