Quest NPC: Keiv Bearclaw in the village south of CLW
Tail Quest NPC: Dorandas in Unkempt North (S)

Speak with Keiv Bearclaw in the village south of CLW. After you have spoken with him roam the area around CLW (NE) until you recieve a pop-up. Doing so triggers two bears, each of which con the same level as the player to trigger them. The pop-up is on a 30 minuter timer. Defeat the bears and return to Keiv.

Keiv will then send you to the Anu Village to seek out a similar pop-up. Located the observatory to the north and roam around the area until you receive a pop-up. You will again be figthing mobs similiar to the first pop-up trigger. Defeat the bears and return to Kiev.

Kiev will now instruct you to seek out the Dorandas in Unkempt North S. Log the tail quest and begin farming the appropriate level bearweres until you recieve the infection pop-up.

After you have become infectioned you will be called upon to defeat Mirin, who can be found in the NW of the Unkempt North. He cons red to a 60, so bring assistance.

"Were" to get infected:

Stonebrunt Mountains (lvl 60 - confirmed)
The Warrens (lvl 51 - confirmed)
Elephant Graveyard
Fort Alliance
Unkempt Glade
North Wilderlands