It's important to remember that:
* Books are not digital files: Books are physical objects, not computer programs, and cannot contain viruses.
* Viruses spread through digital files: Computer viruses spread through files like executables (programs), documents, or attachments.
* No evidence supports this claim: There's no credible source or information suggesting a virus exists within the book.
It's possible you might be thinking of a rumor or misinformation. If you have any specific concerns about a particular source or format of the book, it's best to consult a trusted source or expert.