Mmmm. A line like that conjures all kinds of monstrosities chasing scared innocents through the night. I also imagine it being uttered by one of those iconic movie trailer voice-overs. You know the kind: One of those throaty rasps that say a line like that then follow it up with "starring that guy from those action movies you like."
I suspect Mira Grant has written something a bit more substantial than Hollywood grist for the mill. Feed sounds like it could be a horror/action novel in a similar vein to The Strain by Chuck Hogan and Guillermo Del Toro. A virus infects humanity in 2014, following the medical advances that led to cures for cancer and the common cold. The virus compels its victims to do one thing above all others--feed. I'm will to bet infected vegans take a liking to red meat. The story doesn't deal with the spread of the virus, but the aftermath and a possible secret that could reveal its true source.
Yup, I could probably hop on that bandwagon. Does it sound like the kind of book you'd want to read?