Series information from Goodreads.com.

Sequel to: Cure.

Includes bibliographical references (page 647).

After a young, seemingly healthy woman collapses on the NYC subway and dies by the time she reaches the hospital, her case is initially chalked up to a virulent strain of influenza. During the autopsy, Dr. Jack Stapleton discovers that the young woman has had a heart transplant ... and her DNA matches that of the transplanted heart. When two more incidences of young people with this same sudden and rapid illness follow, Jack fears that a pandemic is eminent, but knows something is off. During his search Jack unveils the dark underbelly of the organ-transplant market, using organs and cells from chimeric pigs. -- adapted from publisher info.