The Miscellaneous Ones

For over 40 years, the world has been plagued with a terrible virus. The Fatalis virus. And the effects were absolutely shocking. Any human it infected, quickly started to become part animal, but they died before two days. But what happens when two twins become infected on their birthday, without even being bitten? And even more shocking, they survive the infection. Being on the insides of the Wall, in Haven where all the last healthy humans remain isnt the most ideal place for two infected people, so what will they do when they are discovered?