yawn... Most viruses are hidden in EXE files.
Something used in Windows OS to install many things.
Linux and Chromebooks cannot download a EXE file.

When a Linux computer and a Chromebook get a new update. (and that's very often)
Everything in the Operating System is Removed and Replaced.
There is no need for anyone to use a Anti-Virus program, or for anyone to use crappy Android Apps.

QUOTE: Chrome OS has several features that make it difficult, or even impossible, for computer viruses to infect Chromebooks. The first is that every time you reboot your Chromebook, it performs a self-check. If it finds any modifications to the system, like files that were modified by a virus, it automatically repairs itself. UNQUOTE: