What's the Name of That Book??? discussion

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The Roar
SOLVED: Children's/YA
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SOLVED. Futuristic & A Plague, rich and poor separated [s]
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Which genre did it best fit: horror, science fiction, mystery etc?

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The Roar (other topics)The Roar (other topics)
I'm trying to find the Title of a book I recently saw on a book lending sight, but I haven't much to go on.
I don't know the Author, the cover (I think) had a silhouette of a man and women and was a blue colour.
The quick synopsis on the back told of a plague/illness and a wall had been built to separate the poor and poorly from the rich and healthy, and these young adults were going over the wall as they were immune or something.
Thanks in advance.
Anne