Board Thread:Lore Discussion/@comment-11345660-20130908095939/@comment-3573184-20130913112056

I wasn't saying that Vyrthur wasn't infected by an initiate, just that the initiate who infected him was infected by a vampire Falmer during the attack, which is why Vyrthur started acting strange around the same time.

But yes, its equally possible Vyrthur turned some of the Falmer into vampires when fighting them off.