A. It’s changed a great deal. We know a lot more about Ebola in the intervening 20 years. Initially, there were a lot of fears that Ebola could mutate to become the airborne Andromeda strain that would wipe us all out. With what we know now about the genetic code of the virus, Ebola does not travel through the air in airborne form and is very unlikely to mutate that way. Another thing that’s been learned about Ebola is the mutation rate. The virus is continually mutating as it’s moving through the human population. It’s testing out its new environment. One of the biggest concerns is that all of our drugs and tests and vaccines for Ebola need to be adjusted. We can adjust the tests, but we need to watch how the virus is doing. We have a whole bunch of new tools that we never had in the 1990s. We now have the ability to use genetic sequencing machines to read the code of the virus again and again. This is like making a video of the virus moving in real time. We now have our eyes on the enemy.

Q. Some of your descriptions of the virus and its symptoms in “The Hot Zone” have been called inaccurate and hyperbolic. Are you planning to release an updated version of “The Hot Zone” with information related to the current crisis?

A. Yes, I am dying to update the book. I want to make the clinical picture of the virus more clear and accurate. In the original “Hot Zone,” I have a description of a nurse weeping tears of blood. That almost certainly didn’t happen. When a person has Ebola, the eyes can turn brilliant red from blood vessels leaking and blood oozing out of the eyelid. That’s horrifying, but it’s not someone with tears of blood running down their face. I want to fix that. The other thing that’s happening with Ebola today is there have been more outbreaks, and virologists are constructing a tree showing how they are related. The names of the viruses and the relationships have changed, and I want to get that into “The Hot Zone.” Finally, I’m going to put in an introduction in which I place the story of “The Hot Zone” in today’s context.

Q. There are reports that “The Hot Zone” is being developed into a TV series for Fox. Will it be based on the book and the earlier outbreak you covered, or the current crisis?

A. I feel pretty confident that they’re going to want to move the story into the current situation. Fox bought the rights to the book way back when, and there was this attempt by Fox to make a movie out of “The Hot Zone,” and it tended tragically in a Hollywood disaster involving Robert Redford and Jodie Foster and Ridley Scott. But the rights have been sitting at Fox ever since. The original screenwriter for the Fox movie and the producer Lynda Obst teamed up and have proposed a TV series to Fox.