World of Warcraft®

Worgen, that is the playable Gilnean Worgen at least, are completely incapable of spreading the Worgen Curse, or Worgen Virus or whatever you choose to call it. An NPC is the Stonetalon Mountains confirms this.

Hierophant Malyk in Farwatcher's Glen has a small Gnomish companion by the name of Salsbury, who wishes to become a "Gnomegen". He believes that by gaining Malyk's trust Malyk will agree to give him the Curse. By talking to Malyk, I found that he said "...He believes that if he gains my trust I could turn him into a Worgen. Even if I wanted to, I couldn't." Or at least something along those lines (keep in mind it's 3a.m. right now for me =] )

So, if someone tries to infect your character, then (politely!) share this little piece of information with them!

(MINOR SPOILER BELOW FROM THE WORGEN STARTING ZONE)
Also, for those who are seeking a reason why the Worgen cannot spread their Curse, yet they had to get cursed by another Worgen to change, I'm assuming it's the pools you drink from that allow you to keep in control when Alchemist Krennan's potion wears off. I'm guessing since they're magical in nature they prevent such "evil" or "recklessness" on the part of you-might-know-what-group-of-Night-Elves from spreading.

Anyway, just trying to help! =]

It's because he's a gnome. There are plenty of other quests where you witness people being infected right in front of you.

Shouldn't Night Elves be able to be affected by the curse as well? Since they were the ones that were cursed first and all.

Humans are the only ones that can be affected by the curse as-is. Night Elves were not "Cursed" so much as taught a Druidic form that slowly consumed them.

Ah. Well, I apologise! At least this thread served it's purpose! People now know how they can be infected and that they cannot through bites. I assumed that he said he couldn't infect Salsbury because the Worgen cannot spread the curse at all, not because he is a gnome.

Again, I apologise for the misinformation.