So in the recent Werellama attack, a fisherman was bitten during his brutal mauling. So brutal was this attack that it contained about 9 entire pages of the dwarf being hit in the head with a sea-lamprey leather shoe. Suffering severe injuries, I was hopeful he would not survive until the full moon. But despite keeping the gates closed so no one could bring water or take him to the hospital, he survived until the moon came, healing his wounds and transforming him into Werellama form. Now that I have a fully copper clad squad, I retained some hope that none would be bitten as they put the beast down. It was simple work for the squad of weapon-masters. I checked the combat log thoroughly to see if anyone else was bitten by the beast. Luckily their flurry of attacks did not leave it any opportunity to bit anyone else. But for some reason, the Spearmaster bit the Werellama in the left lower leg, tearing the muscle. It's well known that a bite from any Werebeast will infect the victim. But will someone who bites the Werebeast also transmit the curse? After making quick work of the Werellama, the dwarves proceeded to attack the Spearmaster as well, killing him before he even had a chance to turn.
My conclusion is that yes, biting a Werebeast in the same manner as a Werebeast bits you, will make you a Werebeast too. But in Soviet Russia, you don't bite the Werebeast, Werebeast bites you.