Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Extremely fun read!

For those of you that love medical thrillers with some fun, gruesome details, plus a spice of mystery and romance, this is the perfect book. I personally am fascinated (and kinda apprehensive) with diseases with the potential to wipe out the world's population, and Reign of the Rat delivers solid medical research with truly horrific possibilities of what a 'super leprosy' could do.