Creepy, Mysterious, Intriguing, Crazy Perfect!

Wow, this first impression has all the must-haves for a perfect YA read, and maybe something a little more to get teens reading! Horror is huge right now--the Tox sounds so creepy with its unknown origin, random attacks, and horrible effects. The all-female cast (so far) is intriguing--their emotions and reactions to the unbelievable setting and plot makes the reader wonder what will happen next and how will the "girls" react? Why have they formed "groups" and will the groups turn on each other? I also love the feeling of desparation--when will they get food? Who will be attacked next? When will they get help from the outside? Would LOVE to read more...