Code Orange by Caroline Cooney
Mitchell "Mitty" Blake is a teenage boy who lives in New York City; he is carefree and does not worry much about his grades or school. When his biology teacher Mr. Lynch assigns him to write a report about an infectious disease, Mitty has no idea what virus to research. During a trip to his family's home in the Connecticut countryside, Mitty finds some old medical books from Boston in 1902. What he discovers in the book changes his life forever.
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