The Hot Zone: A Terrifying True Story is a best-selling 1994 nonfiction thriller by Richard Preston about the origins and incidents involving viral hemorrhagic fevers, particularly ebolaviruses and marburgviruses. The basis of the book was Preston's 1992 New Yorker article "Crisis in the Hot Zone".

The filoviruses—including Ebola virus, Sudan virus, Marburg virus, and Ravn virus—are Biosafety Level 4 agents, extremely dangerous to humans because they are very infectious, have a high fatality rate, and most have no known prophylactic measures, treatments, or cures. Along with describing the history of the devastation caused by two of these Central African diseases, Ebola virus disease and Marburg virus disease, Preston described a 1989 incident in which a relative of Ebola virus, Reston virus, was discovered at a primate quarantine facility in Reston, Virginia, less than 15 miles (24 km) away from Washington, D.C.

The book is in four sections:

The book starts with "Charles Monet" visiting Kitum Cave during a camping trip to Mount Elgon in Central Africa. Not long after, he begins to suffer from a number of symptoms, including vomiting, diarrhea and red eye. He is taken to Nairobi Hospital for treatment, but his condition deteriorates further, and he goes into a coma while in the waiting room. This particular filovirus is called Marburg virus.

Nancy Jaax had been promoted to work in the Level 4 Biosafety containment area at the United States Army Medical Research Institute of Infectious Diseases, and is assigned to research Ebola virus. While preparing food for her family at home, she cuts her right hand. Later, while working on a dead monkey infected with Ebola virus, one of the gloves on the hand with the open wound tears, and she is almost exposed to contaminated blood, but does not get infected. Nurse Mayinga is also infected by a nun and goes to Ngaleima Hospital in Kinshasa for treatment, where she succumbs to the disease.

In Reston, Virginia, less than fifteen miles (24 km) away from Washington, D.C., a company called Hazelton Research once operated a quarantine center for monkeys that were destined for laboratories. In October 1989, when an unusually high number of their monkeys began to die, their veterinarian decided to send some samples to Fort Detrick (USAMRIID) for study. Early during the testing process in biosafety level 3, when one of the flasks appeared to be contaminated with harmless pseudomonas bacterium, two USAMRIID scientists exposed themselves to the virus by wafting the flask. The virus found at the facility was a mutated form of the original Ebola virus and was initially mistaken for simian hemorrhagic fever virus. They later determine that, while the virus is lethal to monkeys, humans can be infected with it without any health effects at all. This virus is now known as Reston virus.

Finally, the author goes to Africa to explore Kitum Cave. On the way, he discusses the role of AIDS in the present, as the Kinshasa Highway that he travels on was sometimes called the "AIDS Highway" after its early appearance in the region. Equipped with a hazmat suit, he enters the cave and finds a large number of animals, one of which might be the virus carrier. At the conclusion of the book, he travels to the quarantine facility in Reston. He finds the building abandoned and deteriorating. He concludes the book by claiming that Ebola will be back.

The discovery of the Reston virus was made in November 1989 by Thomas W. Geisbert, an intern at United States Army Medical Research Institute of Infectious Diseases. Peter B. Jahrling isolated the filovirus further. The Centers for Disease Control and Prevention conducted blood tests of the 178 animal handlers. While six tested positive, they did not exhibit any symptoms. The Reston virus was found to have low pathogenicity in humans. This was further supported later when a handler infected himself during a necropsy of an infected monkey, as the handler did not show symptoms of the virus after the incubation period.