I would have thought that the headline alone would be sufficient enough to provide that answer. In order to remove any further doubt, millions of books are still in circulation, after more than a century since the scare/panic. This should be considered as a fact that books are not infectious ─ not in the medical sense, at least.

A Kindle is probably likely to harbour more germs than an average book. Furthermore, the chemistry of books possibly does not allow harmful organisms to survive for too long.

https://www.scienceabc.com/nature/why-do-books-smell-so-good...

https://www.theguardian.com/books/2017/apr/07/the-smell-of-o...

Most infectious bugs can't survive outside the human body for more than a day or two. Bugs prefer non-porous surfaces. Most books have porous pages, which is good, but of course the covers are non-porous.