Hey all,
I had a bit of trouble doing this quest as i couldn't seem to get infected. But then i tried abandoning the quest and accepting it again, and all of a sudden I got infected on first try.
I think my problem was that i had loggede out in between accepting the quest and trying to do it.
Therefor if anyone have the same problem, try to abandon it and re-accept it... Worked for me :-)
Greetings,
Vookie