Doesn't biting do that?
Not necessarily. A lot of stories require exchanging of blood or a similar process. They usually use this method for plots because having everyone a vampire bites become a vampire would cause a lot of chaos. You usually want there to be some kind of dramatic build up for the changing scene.
But in other stories especially older stories a simple bite or completely draining the person of blood will do the trick. Greatly depends on the author.
Some stories also require some elder or high rank vampire for conversions. So if he's a lesser vampire, it won't work.
I hope they figured out how to turn him into a vampire bcuz that future is just sad otherwise.