Prior to being cursed by Arugal, Berard was researching an ancient plague that killed off all the aquatic life in Lake Lordamere. He has been a Forsaken undead of the Royal Apothecary Society before he was cursed. This is unusual, as most cursed worgen were still-living humans.
Unlike the rest of the population of Pyrewood Village, he doesn't change form during daytime.
It is possible that he is not at all infected with the worgen curse, but is simply transformed into a worgen and being controlled by Arugal, who demonstrates the power to do so in both his Shadowfang Keep and Grizzly Hills encounters.